Update vendor (#852)

77 files changed, 2563 insertions, 416 deletions

diff --git a/vendor/github.com/d5/tengo/README.md b/vendor/github.com/d5/tengo/README.md
index e68b0f86..6a35cfd1 100644
--- a/vendor/github.com/d5/tengo/README.md
+++ b/vendor/github.com/d5/tengo/README.md
@@ -7,6 +7,7 @@
 [![GoDoc](https://godoc.org/github.com/d5/tengo?status.svg)](https://godoc.org/github.com/d5/tengo/script)
 [![Go Report Card](https://goreportcard.com/badge/github.com/d5/tengo)](https://goreportcard.com/report/github.com/d5/tengo)
 [![Build Status](https://travis-ci.org/d5/tengo.svg?branch=master)](https://travis-ci.org/d5/tengo)
+[![Sourcegraph](https://sourcegraph.com/github.com/d5/tengo/-/badge.svg)](https://sourcegraph.com/github.com/d5/tengo?badge)
 
 **Tengo is a small, dynamic, fast, secure script language for Go.** 
 
diff --git a/vendor/github.com/d5/tengo/compiler/ast/ident_list.go b/vendor/github.com/d5/tengo/compiler/ast/ident_list.go
index ee8f7db2..8dd6d307 100644
--- a/vendor/github.com/d5/tengo/compiler/ast/ident_list.go
+++ b/vendor/github.com/d5/tengo/compiler/ast/ident_list.go
@@ -8,9 +8,10 @@ import (
 
 // IdentList represents a list of identifiers.
 type IdentList struct {
-	LParen source.Pos
-	List   []*Ident
-	RParen source.Pos
+	LParen  source.Pos
+	VarArgs bool
+	List    []*Ident
+	RParen  source.Pos
 }
 
 // Pos returns the position of first character belonging to the node.
@@ -50,8 +51,12 @@ func (n *IdentList) NumFields() int {
 
 func (n *IdentList) String() string {
 	var list []string
-	for _, e := range n.List {
-		list = append(list, e.String())
+	for i, e := range n.List {
+		if n.VarArgs && i == len(n.List)-1 {
+			list = append(list, "..."+e.String())
+		} else {
+			list = append(list, e.String())
+		}
 	}
 
 	return "(" + strings.Join(list, ", ") + ")"
diff --git a/vendor/github.com/d5/tengo/compiler/compiler.go b/vendor/github.com/d5/tengo/compiler/compiler.go
index 4a3ec3ad..8bde5dc9 100644
--- a/vendor/github.com/d5/tengo/compiler/compiler.go
+++ b/vendor/github.com/d5/tengo/compiler/compiler.go
@@ -477,6 +477,7 @@ func (c *Compiler) Compile(node ast.Node) error {
 			Instructions:  instructions,
 			NumLocals:     numLocals,
 			NumParameters: len(node.Type.Params.List),
+			VarArgs:       node.Type.Params.VarArgs,
 			SourceMap:     sourceMap,
 		}
 
diff --git a/vendor/github.com/d5/tengo/compiler/instructions.go b/vendor/github.com/d5/tengo/compiler/instructions.go
index 80c88d13..14dde1d8 100644
--- a/vendor/github.com/d5/tengo/compiler/instructions.go
+++ b/vendor/github.com/d5/tengo/compiler/instructions.go
@@ -13,7 +13,7 @@ func MakeInstruction(opcode Opcode, operands ...int) []byte {
 		totalLen += w
 	}
 
-	instruction := make([]byte, totalLen, totalLen)
+	instruction := make([]byte, totalLen)
 	instruction[0] = byte(opcode)
 
 	offset := 1
diff --git a/vendor/github.com/d5/tengo/compiler/parser/parser.go b/vendor/github.com/d5/tengo/compiler/parser/parser.go
index 1f609ab5..27dd48f0 100644
--- a/vendor/github.com/d5/tengo/compiler/parser/parser.go
+++ b/vendor/github.com/d5/tengo/compiler/parser/parser.go
@@ -610,19 +610,31 @@ func (p *Parser) parseIdentList() *ast.IdentList {
 
 	var params []*ast.Ident
 	lparen := p.expect(token.LParen)
+	isVarArgs := false
 	if p.token != token.RParen {
+		if p.token == token.Ellipsis {
+			isVarArgs = true
+			p.next()
+		}
+
 		params = append(params, p.parseIdent())
-		for p.token == token.Comma {
+		for !isVarArgs && p.token == token.Comma {
 			p.next()
+			if p.token == token.Ellipsis {
+				isVarArgs = true
+				p.next()
+			}
 			params = append(params, p.parseIdent())
 		}
 	}
+
 	rparen := p.expect(token.RParen)
 
 	return &ast.IdentList{
-		LParen: lparen,
-		RParen: rparen,
-		List:   params,
+		LParen:  lparen,
+		RParen:  rparen,
+		VarArgs: isVarArgs,
+		List:    params,
 	}
 }
 
diff --git a/vendor/github.com/d5/tengo/compiler/symbol_scopes.go b/vendor/github.com/d5/tengo/compiler/symbol_scopes.go
index 15204b35..e0c0d94b 100644
--- a/vendor/github.com/d5/tengo/compiler/symbol_scopes.go
+++ b/vendor/github.com/d5/tengo/compiler/symbol_scopes.go
@@ -6,7 +6,7 @@ type SymbolScope string
 // List of symbol scopes
 const (
 	ScopeGlobal  SymbolScope = "GLOBAL"
-	ScopeLocal               = "LOCAL"
-	ScopeBuiltin             = "BUILTIN"
-	ScopeFree                = "FREE"
+	ScopeLocal   SymbolScope = "LOCAL"
+	ScopeBuiltin SymbolScope = "BUILTIN"
+	ScopeFree    SymbolScope = "FREE"
 )
diff --git a/vendor/github.com/d5/tengo/objects/builtin_format.go b/vendor/github.com/d5/tengo/objects/builtin_format.go
new file mode 100644
index 00000000..1f0e75ed
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/builtin_format.go
@@ -0,0 +1,27 @@
+package objects
+
+func builtinFormat(args ...Object) (Object, error) {
+	numArgs := len(args)
+	if numArgs == 0 {
+		return nil, ErrWrongNumArguments
+	}
+
+	format, ok := args[0].(*String)
+	if !ok {
+		return nil, ErrInvalidArgumentType{
+			Name:     "format",
+			Expected: "string",
+			Found:    args[0].TypeName(),
+		}
+	}
+	if numArgs == 1 {
+		return format, nil // okay to return 'format' directly as String is immutable
+	}
+
+	s, err := Format(format.Value, args[1:]...)
+	if err != nil {
+		return nil, err
+	}
+
+	return &String{Value: s}, nil
+}
diff --git a/vendor/github.com/d5/tengo/objects/builtins.go b/vendor/github.com/d5/tengo/objects/builtins.go
index bfd004dd..773636ec 100644
--- a/vendor/github.com/d5/tengo/objects/builtins.go
+++ b/vendor/github.com/d5/tengo/objects/builtins.go
@@ -111,4 +111,8 @@ var Builtins = []*BuiltinFunction{
 		Name:  "type_name",
 		Value: builtinTypeName,
 	},
+	{
+		Name:  "format",
+		Value: builtinFormat,
+	},
 }
diff --git a/vendor/github.com/d5/tengo/objects/bytes.go b/vendor/github.com/d5/tengo/objects/bytes.go
index 6710c7c1..5159c22f 100644
--- a/vendor/github.com/d5/tengo/objects/bytes.go
+++ b/vendor/github.com/d5/tengo/objects/bytes.go
@@ -57,7 +57,7 @@ func (o *Bytes) Equals(x Object) bool {
 		return false
 	}
 
-	return bytes.Compare(o.Value, t.Value) == 0
+	return bytes.Equal(o.Value, t.Value)
 }
 
 // IndexGet returns an element (as Int) at a given index.
diff --git a/vendor/github.com/d5/tengo/objects/compiled_function.go b/vendor/github.com/d5/tengo/objects/compiled_function.go
index 606e3d90..d42e69ec 100644
--- a/vendor/github.com/d5/tengo/objects/compiled_function.go
+++ b/vendor/github.com/d5/tengo/objects/compiled_function.go
@@ -10,6 +10,7 @@ type CompiledFunction struct {
 	Instructions  []byte
 	NumLocals     int // number of local variables (including function parameters)
 	NumParameters int
+	VarArgs       bool
 	SourceMap     map[int]source.Pos
 }
 
@@ -34,6 +35,7 @@ func (o *CompiledFunction) Copy() Object {
 		Instructions:  append([]byte{}, o.Instructions...),
 		NumLocals:     o.NumLocals,
 		NumParameters: o.NumParameters,
+		VarArgs:       o.VarArgs,
 	}
 }
 
diff --git a/vendor/github.com/d5/tengo/objects/conversion.go b/vendor/github.com/d5/tengo/objects/conversion.go
index d7cb3a03..27514132 100644
--- a/vendor/github.com/d5/tengo/objects/conversion.go
+++ b/vendor/github.com/d5/tengo/objects/conversion.go
@@ -254,7 +254,7 @@ func FromInterface(v interface{}) (Object, error) {
 	case []Object:
 		return &Array{Value: v}, nil
 	case []interface{}:
-		arr := make([]Object, len(v), len(v))
+		arr := make([]Object, len(v))
 		for i, e := range v {
 			vo, err := FromInterface(e)
 			if err != nil {
diff --git a/vendor/github.com/d5/tengo/objects/formatter.go b/vendor/github.com/d5/tengo/objects/formatter.go
new file mode 100644
index 00000000..95d7f6b1
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/formatter.go
@@ -0,0 +1,1212 @@
+package objects
+
+import (
+	"strconv"
+	"sync"
+	"unicode/utf8"
+
+	"github.com/d5/tengo"
+)
+
+// Strings for use with buffer.WriteString.
+// This is less overhead than using buffer.Write with byte arrays.
+const (
+	commaSpaceString  = ", "
+	nilParenString    = "(nil)"
+	percentBangString = "%!"
+	missingString     = "(MISSING)"
+	badIndexString    = "(BADINDEX)"
+	extraString       = "%!(EXTRA "
+	badWidthString    = "%!(BADWIDTH)"
+	badPrecString     = "%!(BADPREC)"
+	noVerbString      = "%!(NOVERB)"
+)
+
+const (
+	ldigits = "0123456789abcdefx"
+	udigits = "0123456789ABCDEFX"
+)
+
+const (
+	signed   = true
+	unsigned = false
+)
+
+// flags placed in a separate struct for easy clearing.
+type fmtFlags struct {
+	widPresent  bool
+	precPresent bool
+	minus       bool
+	plus        bool
+	sharp       bool
+	space       bool
+	zero        bool
+
+	// For the formats %+v %#v, we set the plusV/sharpV flags
+	// and clear the plus/sharp flags since %+v and %#v are in effect
+	// different, flagless formats set at the top level.
+	plusV  bool
+	sharpV bool
+
+	// error-related flags.
+	inDetail    bool
+	needNewline bool
+	needColon   bool
+}
+
+// A formatter is the raw formatter used by Printf etc.
+// It prints into a buffer that must be set up separately.
+type formatter struct {
+	buf *buffer
+
+	fmtFlags
+
+	wid  int // width
+	prec int // precision
+
+	// intbuf is large enough to store %b of an int64 with a sign and
+	// avoids padding at the end of the struct on 32 bit architectures.
+	intbuf [68]byte
+}
+
+func (f *formatter) clearflags() {
+	f.fmtFlags = fmtFlags{}
+}
+
+func (f *formatter) init(buf *buffer) {
+	f.buf = buf
+	f.clearflags()
+}
+
+// writePadding generates n bytes of padding.
+func (f *formatter) writePadding(n int) {
+	if n <= 0 { // No padding bytes needed.
+		return
+	}
+	buf := *f.buf
+	oldLen := len(buf)
+	newLen := oldLen + n
+
+	if newLen > tengo.MaxStringLen {
+		panic(ErrStringLimit)
+	}
+
+	// Make enough room for padding.
+	if newLen > cap(buf) {
+		buf = make(buffer, cap(buf)*2+n)
+		copy(buf, *f.buf)
+	}
+	// Decide which byte the padding should be filled with.
+	padByte := byte(' ')
+	if f.zero {
+		padByte = byte('0')
+	}
+	// Fill padding with padByte.
+	padding := buf[oldLen:newLen]
+	for i := range padding {
+		padding[i] = padByte
+	}
+	*f.buf = buf[:newLen]
+}
+
+// pad appends b to f.buf, padded on left (!f.minus) or right (f.minus).
+func (f *formatter) pad(b []byte) {
+	if !f.widPresent || f.wid == 0 {
+		f.buf.Write(b)
+		return
+	}
+	width := f.wid - utf8.RuneCount(b)
+	if !f.minus {
+		// left padding
+		f.writePadding(width)
+		f.buf.Write(b)
+	} else {
+		// right padding
+		f.buf.Write(b)
+		f.writePadding(width)
+	}
+}
+
+// padString appends s to f.buf, padded on left (!f.minus) or right (f.minus).
+func (f *formatter) padString(s string) {
+	if !f.widPresent || f.wid == 0 {
+		f.buf.WriteString(s)
+		return
+	}
+	width := f.wid - utf8.RuneCountInString(s)
+	if !f.minus {
+		// left padding
+		f.writePadding(width)
+		f.buf.WriteString(s)
+	} else {
+		// right padding
+		f.buf.WriteString(s)
+		f.writePadding(width)
+	}
+}
+
+// fmtBoolean formats a boolean.
+func (f *formatter) fmtBoolean(v bool) {
+	if v {
+		f.padString("true")
+	} else {
+		f.padString("false")
+	}
+}
+
+// fmtUnicode formats a uint64 as "U+0078" or with f.sharp set as "U+0078 'x'".
+func (f *formatter) fmtUnicode(u uint64) {
+	buf := f.intbuf[0:]
+
+	// With default precision set the maximum needed buf length is 18
+	// for formatting -1 with %#U ("U+FFFFFFFFFFFFFFFF") which fits
+	// into the already allocated intbuf with a capacity of 68 bytes.
+	prec := 4
+	if f.precPresent && f.prec > 4 {
+		prec = f.prec
+		// Compute space needed for "U+" , number, " '", character, "'".
+		width := 2 + prec + 2 + utf8.UTFMax + 1
+		if width > len(buf) {
+			buf = make([]byte, width)
+		}
+	}
+
+	// Format into buf, ending at buf[i]. Formatting numbers is easier right-to-left.
+	i := len(buf)
+
+	// For %#U we want to add a space and a quoted character at the end of the buffer.
+	if f.sharp && u <= utf8.MaxRune && strconv.IsPrint(rune(u)) {
+		i--
+		buf[i] = '\''
+		i -= utf8.RuneLen(rune(u))
+		utf8.EncodeRune(buf[i:], rune(u))
+		i--
+		buf[i] = '\''
+		i--
+		buf[i] = ' '
+	}
+	// Format the Unicode code point u as a hexadecimal number.
+	for u >= 16 {
+		i--
+		buf[i] = udigits[u&0xF]
+		prec--
+		u >>= 4
+	}
+	i--
+	buf[i] = udigits[u]
+	prec--
+	// Add zeros in front of the number until requested precision is reached.
+	for prec > 0 {
+		i--
+		buf[i] = '0'
+		prec--
+	}
+	// Add a leading "U+".
+	i--
+	buf[i] = '+'
+	i--
+	buf[i] = 'U'
+
+	oldZero := f.zero
+	f.zero = false
+	f.pad(buf[i:])
+	f.zero = oldZero
+}
+
+// fmtInteger formats signed and unsigned integers.
+func (f *formatter) fmtInteger(u uint64, base int, isSigned bool, verb rune, digits string) {
+	negative := isSigned && int64(u) < 0
+	if negative {
+		u = -u
+	}
+
+	buf := f.intbuf[0:]
+	// The already allocated f.intbuf with a capacity of 68 bytes
+	// is large enough for integer formatting when no precision or width is set.
+	if f.widPresent || f.precPresent {
+		// Account 3 extra bytes for possible addition of a sign and "0x".
+		width := 3 + f.wid + f.prec // wid and prec are always positive.
+		if width > len(buf) {
+			// We're going to need a bigger boat.
+			buf = make([]byte, width)
+		}
+	}
+
+	// Two ways to ask for extra leading zero digits: %.3d or %03d.
+	// If both are specified the f.zero flag is ignored and
+	// padding with spaces is used instead.
+	prec := 0
+	if f.precPresent {
+		prec = f.prec
+		// Precision of 0 and value of 0 means "print nothing" but padding.
+		if prec == 0 && u == 0 {
+			oldZero := f.zero
+			f.zero = false
+			f.writePadding(f.wid)
+			f.zero = oldZero
+			return
+		}
+	} else if f.zero && f.widPresent {
+		prec = f.wid
+		if negative || f.plus || f.space {
+			prec-- // leave room for sign
+		}
+	}
+
+	// Because printing is easier right-to-left: format u into buf, ending at buf[i].
+	// We could make things marginally faster by splitting the 32-bit case out
+	// into a separate block but it's not worth the duplication, so u has 64 bits.
+	i := len(buf)
+	// Use constants for the division and modulo for more efficient code.
+	// Switch cases ordered by popularity.
+	switch base {
+	case 10:
+		for u >= 10 {
+			i--
+			next := u / 10
+			buf[i] = byte('0' + u - next*10)
+			u = next
+		}
+	case 16:
+		for u >= 16 {
+			i--
+			buf[i] = digits[u&0xF]
+			u >>= 4
+		}
+	case 8:
+		for u >= 8 {
+			i--
+			buf[i] = byte('0' + u&7)
+			u >>= 3
+		}
+	case 2:
+		for u >= 2 {
+			i--
+			buf[i] = byte('0' + u&1)
+			u >>= 1
+		}
+	default:
+		panic("fmt: unknown base; can't happen")
+	}
+	i--
+	buf[i] = digits[u]
+	for i > 0 && prec > len(buf)-i {
+		i--
+		buf[i] = '0'
+	}
+
+	// Various prefixes: 0x, -, etc.
+	if f.sharp {
+		switch base {
+		case 2:
+			// Add a leading 0b.
+			i--
+			buf[i] = 'b'
+			i--
+			buf[i] = '0'
+		case 8:
+			if buf[i] != '0' {
+				i--
+				buf[i] = '0'
+			}
+		case 16:
+			// Add a leading 0x or 0X.
+			i--
+			buf[i] = digits[16]
+			i--
+			buf[i] = '0'
+		}
+	}
+	if verb == 'O' {
+		i--
+		buf[i] = 'o'
+		i--
+		buf[i] = '0'
+	}
+
+	if negative {
+		i--
+		buf[i] = '-'
+	} else if f.plus {
+		i--
+		buf[i] = '+'
+	} else if f.space {
+		i--
+		buf[i] = ' '
+	}
+
+	// Left padding with zeros has already been handled like precision earlier
+	// or the f.zero flag is ignored due to an explicitly set precision.
+	oldZero := f.zero
+	f.zero = false
+	f.pad(buf[i:])
+	f.zero = oldZero
+}
+
+// truncate truncates the string s to the specified precision, if present.
+func (f *formatter) truncateString(s string) string {
+	if f.precPresent {
+		n := f.prec
+		for i := range s {
+			n--
+			if n < 0 {
+				return s[:i]
+			}
+		}
+	}
+	return s
+}
+
+// truncate truncates the byte slice b as a string of the specified precision, if present.
+func (f *formatter) truncate(b []byte) []byte {
+	if f.precPresent {
+		n := f.prec
+		for i := 0; i < len(b); {
+			n--
+			if n < 0 {
+				return b[:i]
+			}
+			wid := 1
+			if b[i] >= utf8.RuneSelf {
+				_, wid = utf8.DecodeRune(b[i:])
+			}
+			i += wid
+		}
+	}
+	return b
+}
+
+// fmtS formats a string.
+func (f *formatter) fmtS(s string) {
+	s = f.truncateString(s)
+	f.padString(s)
+}
+
+// fmtBs formats the byte slice b as if it was formatted as string with fmtS.
+func (f *formatter) fmtBs(b []byte) {
+	b = f.truncate(b)
+	f.pad(b)
+}
+
+// fmtSbx formats a string or byte slice as a hexadecimal encoding of its bytes.
+func (f *formatter) fmtSbx(s string, b []byte, digits string) {
+	length := len(b)
+	if b == nil {
+		// No byte slice present. Assume string s should be encoded.
+		length = len(s)
+	}
+	// Set length to not process more bytes than the precision demands.
+	if f.precPresent && f.prec < length {
+		length = f.prec
+	}
+	// Compute width of the encoding taking into account the f.sharp and f.space flag.
+	width := 2 * length
+	if width > 0 {
+		if f.space {
+			// Each element encoded by two hexadecimals will get a leading 0x or 0X.
+			if f.sharp {
+				width *= 2
+			}
+			// Elements will be separated by a space.
+			width += length - 1
+		} else if f.sharp {
+			// Only a leading 0x or 0X will be added for the whole string.
+			width += 2
+		}
+	} else { // The byte slice or string that should be encoded is empty.
+		if f.widPresent {
+			f.writePadding(f.wid)
+		}
+		return
+	}
+	// Handle padding to the left.
+	if f.widPresent && f.wid > width && !f.minus {
+		f.writePadding(f.wid - width)
+	}
+	// Write the encoding directly into the output buffer.
+	buf := *f.buf
+	if f.sharp {
+		// Add leading 0x or 0X.
+		buf = append(buf, '0', digits[16])
+	}
+	var c byte
+	for i := 0; i < length; i++ {
+		if f.space && i > 0 {
+			// Separate elements with a space.
+			buf = append(buf, ' ')
+			if f.sharp {
+				// Add leading 0x or 0X for each element.
+				buf = append(buf, '0', digits[16])
+			}
+		}
+		if b != nil {
+			c = b[i] // Take a byte from the input byte slice.
+		} else {
+			c = s[i] // Take a byte from the input string.
+		}
+		// Encode each byte as two hexadecimal digits.
+		buf = append(buf, digits[c>>4], digits[c&0xF])
+	}
+	*f.buf = buf
+	// Handle padding to the right.
+	if f.widPresent && f.wid > width && f.minus {
+		f.writePadding(f.wid - width)
+	}
+}
+
+// fmtSx formats a string as a hexadecimal encoding of its bytes.
+func (f *formatter) fmtSx(s, digits string) {
+	f.fmtSbx(s, nil, digits)
+}
+
+// fmtBx formats a byte slice as a hexadecimal encoding of its bytes.
+func (f *formatter) fmtBx(b []byte, digits string) {
+	f.fmtSbx("", b, digits)
+}
+
+// fmtQ formats a string as a double-quoted, escaped Go string constant.
+// If f.sharp is set a raw (backquoted) string may be returned instead
+// if the string does not contain any control characters other than tab.
+func (f *formatter) fmtQ(s string) {
+	s = f.truncateString(s)
+	if f.sharp && strconv.CanBackquote(s) {
+		f.padString("`" + s + "`")
+		return
+	}
+	buf := f.intbuf[:0]
+	if f.plus {
+		f.pad(strconv.AppendQuoteToASCII(buf, s))
+	} else {
+		f.pad(strconv.AppendQuote(buf, s))
+	}
+}
+
+// fmtC formats an integer as a Unicode character.
+// If the character is not valid Unicode, it will print '\ufffd'.
+func (f *formatter) fmtC(c uint64) {
+	r := rune(c)
+	if c > utf8.MaxRune {
+		r = utf8.RuneError
+	}
+	buf := f.intbuf[:0]
+	w := utf8.EncodeRune(buf[:utf8.UTFMax], r)
+	f.pad(buf[:w])
+}
+
+// fmtQc formats an integer as a single-quoted, escaped Go character constant.
+// If the character is not valid Unicode, it will print '\ufffd'.
+func (f *formatter) fmtQc(c uint64) {
+	r := rune(c)
+	if c > utf8.MaxRune {
+		r = utf8.RuneError
+	}
+	buf := f.intbuf[:0]
+	if f.plus {
+		f.pad(strconv.AppendQuoteRuneToASCII(buf, r))
+	} else {
+		f.pad(strconv.AppendQuoteRune(buf, r))
+	}
+}
+
+// fmtFloat formats a float64. It assumes that verb is a valid format specifier
+// for strconv.AppendFloat and therefore fits into a byte.
+func (f *formatter) fmtFloat(v float64, size int, verb rune, prec int) {
+	// Explicit precision in format specifier overrules default precision.
+	if f.precPresent {
+		prec = f.prec
+	}
+	// Format number, reserving space for leading + sign if needed.
+	num := strconv.AppendFloat(f.intbuf[:1], v, byte(verb), prec, size)
+	if num[1] == '-' || num[1] == '+' {
+		num = num[1:]
+	} else {
+		num[0] = '+'
+	}
+	// f.space means to add a leading space instead of a "+" sign unless
+	// the sign is explicitly asked for by f.plus.
+	if f.space && num[0] == '+' && !f.plus {
+		num[0] = ' '
+	}
+	// Special handling for infinities and NaN,
+	// which don't look like a number so shouldn't be padded with zeros.
+	if num[1] == 'I' || num[1] == 'N' {
+		oldZero := f.zero
+		f.zero = false
+		// Remove sign before NaN if not asked for.
+		if num[1] == 'N' && !f.space && !f.plus {
+			num = num[1:]
+		}
+		f.pad(num)
+		f.zero = oldZero
+		return
+	}
+	// The sharp flag forces printing a decimal point for non-binary formats
+	// and retains trailing zeros, which we may need to restore.
+	if f.sharp && verb != 'b' {
+		digits := 0
+		switch verb {
+		case 'v', 'g', 'G', 'x':
+			digits = prec
+			// If no precision is set explicitly use a precision of 6.
+			if digits == -1 {
+				digits = 6
+			}
+		}
+
+		// Buffer pre-allocated with enough room for
+		// exponent notations of the form "e+123" or "p-1023".
+		var tailBuf [6]byte
+		tail := tailBuf[:0]
+
+		hasDecimalPoint := false
+		// Starting from i = 1 to skip sign at num[0].
+		for i := 1; i < len(num); i++ {
+			switch num[i] {
+			case '.':
+				hasDecimalPoint = true
+			case 'p', 'P':
+				tail = append(tail, num[i:]...)
+				num = num[:i]
+			case 'e', 'E':
+				if verb != 'x' && verb != 'X' {
+					tail = append(tail, num[i:]...)
+					num = num[:i]
+					break
+				}
+				fallthrough
+			default:
+				digits--
+			}
+		}
+		if !hasDecimalPoint {
+			num = append(num, '.')
+		}
+		for digits > 0 {
+			num = append(num, '0')
+			digits--
+		}
+		num = append(num, tail...)
+	}
+	// We want a sign if asked for and if the sign is not positive.
+	if f.plus || num[0] != '+' {
+		// If we're zero padding to the left we want the sign before the leading zeros.
+		// Achieve this by writing the sign out and then padding the unsigned number.
+		if f.zero && f.widPresent && f.wid > len(num) {
+			f.buf.WriteSingleByte(num[0])
+			f.writePadding(f.wid - len(num))
+			f.buf.Write(num[1:])
+			return
+		}
+		f.pad(num)
+		return
+	}
+	// No sign to show and the number is positive; just print the unsigned number.
+	f.pad(num[1:])
+}
+
+// Use simple []byte instead of bytes.Buffer to avoid large dependency.
+type buffer []byte
+
+func (b *buffer) Write(p []byte) {
+	if len(*b)+len(p) > tengo.MaxStringLen {
+		panic(ErrStringLimit)
+	}
+
+	*b = append(*b, p...)
+}
+
+func (b *buffer) WriteString(s string) {
+	if len(*b)+len(s) > tengo.MaxStringLen {
+		panic(ErrStringLimit)
+	}
+
+	*b = append(*b, s...)
+}
+
+func (b *buffer) WriteSingleByte(c byte) {
+	if len(*b) >= tengo.MaxStringLen {
+		panic(ErrStringLimit)
+	}
+
+	*b = append(*b, c)
+}
+
+func (b *buffer) WriteRune(r rune) {
+	if len(*b)+utf8.RuneLen(r) > tengo.MaxStringLen {
+		panic(ErrStringLimit)
+	}
+
+	if r < utf8.RuneSelf {
+		*b = append(*b, byte(r))
+		return
+	}
+
+	b2 := *b
+	n := len(b2)
+	for n+utf8.UTFMax > cap(b2) {
+		b2 = append(b2, 0)
+	}
+	w := utf8.EncodeRune(b2[n:n+utf8.UTFMax], r)
+	*b = b2[:n+w]
+}
+
+// pp is used to store a printer's state and is reused with sync.Pool to avoid allocations.
+type pp struct {
+	buf buffer
+
+	// arg holds the current item.
+	arg Object
+
+	// fmt is used to format basic items such as integers or strings.
+	fmt formatter
+
+	// reordered records whether the format string used argument reordering.
+	reordered bool
+
+	// goodArgNum records whether the most recent reordering directive was valid.
+	goodArgNum bool
+
+	// erroring is set when printing an error string to guard against calling handleMethods.
+	erroring bool
+}
+
+var ppFree = sync.Pool{
+	New: func() interface{} { return new(pp) },
+}
+
+// newPrinter allocates a new pp struct or grabs a cached one.
+func newPrinter() *pp {
+	p := ppFree.Get().(*pp)
+	p.erroring = false
+	p.fmt.init(&p.buf)
+	return p
+}
+
+// free saves used pp structs in ppFree; avoids an allocation per invocation.
+func (p *pp) free() {
+	// Proper usage of a sync.Pool requires each entry to have approximately
+	// the same memory cost. To obtain this property when the stored type
+	// contains a variably-sized buffer, we add a hard limit on the maximum buffer
+	// to place back in the pool.
+	//
+	// See https://golang.org/issue/23199
+	if cap(p.buf) > 64<<10 {
+		return
+	}
+
+	p.buf = p.buf[:0]
+	p.arg = nil
+	ppFree.Put(p)
+}
+
+func (p *pp) Width() (wid int, ok bool) { return p.fmt.wid, p.fmt.widPresent }
+
+func (p *pp) Precision() (prec int, ok bool) { return p.fmt.prec, p.fmt.precPresent }
+
+func (p *pp) Flag(b int) bool {
+	switch b {
+	case '-':
+		return p.fmt.minus
+	case '+':
+		return p.fmt.plus || p.fmt.plusV
+	case '#':
+		return p.fmt.sharp || p.fmt.sharpV
+	case ' ':
+		return p.fmt.space
+	case '0':
+		return p.fmt.zero
+	}
+	return false
+}
+
+// Implement Write so we can call Fprintf on a pp (through State), for
+// recursive use in custom verbs.
+func (p *pp) Write(b []byte) (ret int, err error) {
+	p.buf.Write(b)
+	return len(b), nil
+}
+
+// Implement WriteString so that we can call io.WriteString
+// on a pp (through state), for efficiency.
+func (p *pp) WriteString(s string) (ret int, err error) {
+	p.buf.WriteString(s)
+	return len(s), nil
+}
+
+func (p *pp) WriteRune(r rune) (ret int, err error) {
+	p.buf.WriteRune(r)
+	return utf8.RuneLen(r), nil
+}
+
+func (p *pp) WriteSingleByte(c byte) (ret int, err error) {
+	p.buf.WriteSingleByte(c)
+	return 1, nil
+}
+
+// tooLarge reports whether the magnitude of the integer is
+// too large to be used as a formatting width or precision.
+func tooLarge(x int) bool {
+	const max int = 1e6
+	return x > max || x < -max
+}
+
+// parsenum converts ASCII to integer.  num is 0 (and isnum is false) if no number present.
+func parsenum(s string, start, end int) (num int, isnum bool, newi int) {
+	if start >= end {
+		return 0, false, end
+	}
+	for newi = start; newi < end && '0' <= s[newi] && s[newi] <= '9'; newi++ {
+		if tooLarge(num) {
+			return 0, false, end // Overflow; crazy long number most likely.
+		}
+		num = num*10 + int(s[newi]-'0')
+		isnum = true
+	}
+	return
+}
+
+func (p *pp) badVerb(verb rune) {
+	p.erroring = true
+	_, _ = p.WriteString(percentBangString)
+	_, _ = p.WriteRune(verb)
+	_, _ = p.WriteSingleByte('(')
+	switch {
+	case p.arg != nil:
+		_, _ = p.WriteString(p.arg.String())
+		_, _ = p.WriteSingleByte('=')
+		p.printArg(p.arg, 'v')
+	default:
+		_, _ = p.WriteString(UndefinedValue.String())
+	}
+	_, _ = p.WriteSingleByte(')')
+	p.erroring = false
+}
+
+func (p *pp) fmtBool(v bool, verb rune) {
+	switch verb {
+	case 't', 'v':
+		p.fmt.fmtBoolean(v)
+	default:
+		p.badVerb(verb)
+	}
+}
+
+// fmt0x64 formats a uint64 in hexadecimal and prefixes it with 0x or
+// not, as requested, by temporarily setting the sharp flag.
+func (p *pp) fmt0x64(v uint64, leading0x bool) {
+	sharp := p.fmt.sharp
+	p.fmt.sharp = leading0x
+	p.fmt.fmtInteger(v, 16, unsigned, 'v', ldigits)
+	p.fmt.sharp = sharp
+}
+
+// fmtInteger formats a signed or unsigned integer.
+func (p *pp) fmtInteger(v uint64, isSigned bool, verb rune) {
+	switch verb {
+	case 'v':
+		if p.fmt.sharpV && !isSigned {
+			p.fmt0x64(v, true)
+		} else {
+			p.fmt.fmtInteger(v, 10, isSigned, verb, ldigits)
+		}
+	case 'd':
+		p.fmt.fmtInteger(v, 10, isSigned, verb, ldigits)
+	case 'b':
+		p.fmt.fmtInteger(v, 2, isSigned, verb, ldigits)
+	case 'o', 'O':
+		p.fmt.fmtInteger(v, 8, isSigned, verb, ldigits)
+	case 'x':
+		p.fmt.fmtInteger(v, 16, isSigned, verb, ldigits)
+	case 'X':
+		p.fmt.fmtInteger(v, 16, isSigned, verb, udigits)
+	case 'c':
+		p.fmt.fmtC(v)
+	case 'q':
+		if v <= utf8.MaxRune {
+			p.fmt.fmtQc(v)
+		} else {
+			p.badVerb(verb)
+		}
+	case 'U':
+		p.fmt.fmtUnicode(v)
+	default:
+		p.badVerb(verb)
+	}
+}
+
+// fmtFloat formats a float. The default precision for each verb
+// is specified as last argument in the call to fmt_float.
+func (p *pp) fmtFloat(v float64, size int, verb rune) {
+	switch verb {
+	case 'v':
+		p.fmt.fmtFloat(v, size, 'g', -1)
+	case 'b', 'g', 'G', 'x', 'X':
+		p.fmt.fmtFloat(v, size, verb, -1)
+	case 'f', 'e', 'E':
+		p.fmt.fmtFloat(v, size, verb, 6)
+	case 'F':
+		p.fmt.fmtFloat(v, size, 'f', 6)
+	default:
+		p.badVerb(verb)
+	}
+}
+
+func (p *pp) fmtString(v string, verb rune) {
+	switch verb {
+	case 'v':
+		if p.fmt.sharpV {
+			p.fmt.fmtQ(v)
+		} else {
+			p.fmt.fmtS(v)
+		}
+	case 's':
+		p.fmt.fmtS(v)
+	case 'x':
+		p.fmt.fmtSx(v, ldigits)
+	case 'X':
+		p.fmt.fmtSx(v, udigits)
+	case 'q':
+		p.fmt.fmtQ(v)
+	default:
+		p.badVerb(verb)
+	}
+}
+
+func (p *pp) fmtBytes(v []byte, verb rune, typeString string) {
+	switch verb {
+	case 'v', 'd':
+		if p.fmt.sharpV {
+			_, _ = p.WriteString(typeString)
+			if v == nil {
+				_, _ = p.WriteString(nilParenString)
+				return
+			}
+			_, _ = p.WriteSingleByte('{')
+			for i, c := range v {
+				if i > 0 {
+					_, _ = p.WriteString(commaSpaceString)
+				}
+				p.fmt0x64(uint64(c), true)
+			}
+			_, _ = p.WriteSingleByte('}')
+		} else {
+			_, _ = p.WriteSingleByte('[')
+			for i, c := range v {
+				if i > 0 {
+					_, _ = p.WriteSingleByte(' ')
+				}
+				p.fmt.fmtInteger(uint64(c), 10, unsigned, verb, ldigits)
+			}
+			_, _ = p.WriteSingleByte(']')
+		}
+	case 's':
+		p.fmt.fmtBs(v)
+	case 'x':
+		p.fmt.fmtBx(v, ldigits)
+	case 'X':
+		p.fmt.fmtBx(v, udigits)
+	case 'q':
+		p.fmt.fmtQ(string(v))
+	}
+}
+
+func (p *pp) printArg(arg Object, verb rune) {
+	p.arg = arg
+
+	if arg == nil {
+		arg = UndefinedValue
+	}
+
+	// Special processing considerations.
+	// %T (the value's type) and %p (its address) are special; we always do them first.
+	switch verb {
+	case 'T':
+		p.fmt.fmtS(arg.TypeName())
+		return
+	case 'v':
+		p.fmt.fmtS(arg.String())
+		return
+	}
+
+	// Some types can be done without reflection.
+	switch f := arg.(type) {
+	case *Bool:
+		p.fmtBool(!f.IsFalsy(), verb)
+	case *Float:
+		p.fmtFloat(f.Value, 64, verb)
+	case *Int:
+		p.fmtInteger(uint64(f.Value), signed, verb)
+	case *String:
+		p.fmtString(f.Value, verb)
+	case *Bytes:
+		p.fmtBytes(f.Value, verb, "[]byte")
+	default:
+		p.fmtString(f.String(), verb)
+	}
+}
+
+// intFromArg gets the argNumth element of a. On return, isInt reports whether the argument has integer type.
+func intFromArg(a []Object, argNum int) (num int, isInt bool, newArgNum int) {
+	newArgNum = argNum
+	if argNum < len(a) {
+		var num64 int64
+		num64, isInt = ToInt64(a[argNum])
+		num = int(num64)
+		newArgNum = argNum + 1
+		if tooLarge(num) {
+			num = 0
+			isInt = false
+		}
+	}
+	return
+}
+
+// parseArgNumber returns the value of the bracketed number, minus 1
+// (explicit argument numbers are one-indexed but we want zero-indexed).
+// The opening bracket is known to be present at format[0].
+// The returned values are the index, the number of bytes to consume
+// up to the closing paren, if present, and whether the number parsed
+// ok. The bytes to consume will be 1 if no closing paren is present.
+func parseArgNumber(format string) (index int, wid int, ok bool) {
+	// There must be at least 3 bytes: [n].
+	if len(format) < 3 {
+		return 0, 1, false
+	}
+
+	// Find closing bracket.
+	for i := 1; i < len(format); i++ {
+		if format[i] == ']' {
+			width, ok, newi := parsenum(format, 1, i)
+			if !ok || newi != i {
+				return 0, i + 1, false
+			}
+			return width - 1, i + 1, true // arg numbers are one-indexed and skip paren.
+		}
+	}
+	return 0, 1, false
+}
+
+// argNumber returns the next argument to evaluate, which is either the value of the passed-in
+// argNum or the value of the bracketed integer that begins format[i:]. It also returns
+// the new value of i, that is, the index of the next byte of the format to process.
+func (p *pp) argNumber(argNum int, format string, i int, numArgs int) (newArgNum, newi int, found bool) {
+	if len(format) <= i || format[i] != '[' {
+		return argNum, i, false
+	}
+	p.reordered = true
+	index, wid, ok := parseArgNumber(format[i:])
+	if ok && 0 <= index && index < numArgs {
+		return index, i + wid, true
+	}
+	p.goodArgNum = false
+	return argNum, i + wid, ok
+}
+
+func (p *pp) badArgNum(verb rune) {
+	_, _ = p.WriteString(percentBangString)
+	_, _ = p.WriteRune(verb)
+	_, _ = p.WriteString(badIndexString)
+}
+
+func (p *pp) missingArg(verb rune) {
+	_, _ = p.WriteString(percentBangString)
+	_, _ = p.WriteRune(verb)
+	_, _ = p.WriteString(missingString)
+}
+
+func (p *pp) doFormat(format string, a []Object) (err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			if e, ok := r.(error); ok && e == ErrStringLimit {
+				err = e
+				return
+			}
+			panic(r)
+		}
+	}()
+
+	end := len(format)
+	argNum := 0         // we process one argument per non-trivial format
+	afterIndex := false // previous item in format was an index like [3].
+	p.reordered = false
+formatLoop:
+	for i := 0; i < end; {
+		p.goodArgNum = true
+		lasti := i
+		for i < end && format[i] != '%' {
+			i++
+		}
+		if i > lasti {
+			_, _ = p.WriteString(format[lasti:i])
+		}
+		if i >= end {
+			// done processing format string
+			break
+		}
+
+		// Process one verb
+		i++
+
+		// Do we have flags?
+		p.fmt.clearflags()
+	simpleFormat:
+		for ; i < end; i++ {
+			c := format[i]
+			switch c {
+			case '#':
+				p.fmt.sharp = true
+			case '0':
+				p.fmt.zero = !p.fmt.minus // Only allow zero padding to the left.
+			case '+':
+				p.fmt.plus = true
+			case '-':
+				p.fmt.minus = true
+				p.fmt.zero = false // Do not pad with zeros to the right.
+			case ' ':
+				p.fmt.space = true
+			default:
+				// Fast path for common case of ascii lower case simple verbs
+				// without precision or width or argument indices.
+				if 'a' <= c && c <= 'z' && argNum < len(a) {
+					if c == 'v' {
+						// Go syntax
+						p.fmt.sharpV = p.fmt.sharp
+						p.fmt.sharp = false
+						// Struct-field syntax
+						p.fmt.plusV = p.fmt.plus
+						p.fmt.plus = false
+					}
+					p.printArg(a[argNum], rune(c))
+					argNum++
+					i++
+					continue formatLoop
+				}
+				// Format is more complex than simple flags and a verb or is malformed.
+				break simpleFormat
+			}
+		}
+
+		// Do we have an explicit argument index?
+		argNum, i, afterIndex = p.argNumber(argNum, format, i, len(a))
+
+		// Do we have width?
+		if i < end && format[i] == '*' {
+			i++
+			p.fmt.wid, p.fmt.widPresent, argNum = intFromArg(a, argNum)
+
+			if !p.fmt.widPresent {
+				_, _ = p.WriteString(badWidthString)
+			}
+
+			// We have a negative width, so take its value and ensure
+			// that the minus flag is set
+			if p.fmt.wid < 0 {
+				p.fmt.wid = -p.fmt.wid
+				p.fmt.minus = true
+				p.fmt.zero = false // Do not pad with zeros to the right.
+			}
+			afterIndex = false
+		} else {
+			p.fmt.wid, p.fmt.widPresent, i = parsenum(format, i, end)
+			if afterIndex && p.fmt.widPresent { // "%[3]2d"
+				p.goodArgNum = false
+			}
+		}
+
+		// Do we have precision?
+		if i+1 < end && format[i] == '.' {
+			i++
+			if afterIndex { // "%[3].2d"
+				p.goodArgNum = false
+			}
+			argNum, i, afterIndex = p.argNumber(argNum, format, i, len(a))
+			if i < end && format[i] == '*' {
+				i++
+				p.fmt.prec, p.fmt.precPresent, argNum = intFromArg(a, argNum)
+				// Negative precision arguments don't make sense
+				if p.fmt.prec < 0 {
+					p.fmt.prec = 0
+					p.fmt.precPresent = false
+				}
+				if !p.fmt.precPresent {
+					_, _ = p.WriteString(badPrecString)
+				}
+				afterIndex = false
+			} else {
+				p.fmt.prec, p.fmt.precPresent, i = parsenum(format, i, end)
+				if !p.fmt.precPresent {
+					p.fmt.prec = 0
+					p.fmt.precPresent = true
+				}
+			}
+		}
+
+		if !afterIndex {
+			argNum, i, afterIndex = p.argNumber(argNum, format, i, len(a))
+		}
+
+		if i >= end {
+			_, _ = p.WriteString(noVerbString)
+			break
+		}
+
+		verb, size := rune(format[i]), 1
+		if verb >= utf8.RuneSelf {
+			verb, size = utf8.DecodeRuneInString(format[i:])
+		}
+		i += size
+
+		switch {
+		case verb == '%': // Percent does not absorb operands and ignores f.wid and f.prec.
+			_, _ = p.WriteSingleByte('%')
+		case !p.goodArgNum:
+			p.badArgNum(verb)
+		case argNum >= len(a): // No argument left over to print for the current verb.
+			p.missingArg(verb)
+		case verb == 'v':
+			// Go syntax
+			p.fmt.sharpV = p.fmt.sharp
+			p.fmt.sharp = false
+			// Struct-field syntax
+			p.fmt.plusV = p.fmt.plus
+			p.fmt.plus = false
+			fallthrough
+		default:
+			p.printArg(a[argNum], verb)
+			argNum++
+		}
+	}
+
+	// Check for extra arguments unless the call accessed the arguments
+	// out of order, in which case it's too expensive to detect if they've all
+	// been used and arguably OK if they're not.
+	if !p.reordered && argNum < len(a) {
+		p.fmt.clearflags()
+		_, _ = p.WriteString(extraString)
+		for i, arg := range a[argNum:] {
+			if i > 0 {
+				_, _ = p.WriteString(commaSpaceString)
+			}
+			if arg == nil {
+				_, _ = p.WriteString(UndefinedValue.String())
+			} else {
+				_, _ = p.WriteString(arg.TypeName())
+				_, _ = p.WriteSingleByte('=')
+				p.printArg(arg, 'v')
+			}
+		}
+		_, _ = p.WriteSingleByte(')')
+	}
+
+	return nil
+}
+
+// Format formats according to a format specifier and returns the resulting string.
+func Format(format string, a ...Object) (string, error) {
+	p := newPrinter()
+	err := p.doFormat(format, a)
+	s := string(p.buf)
+	p.free()
+
+	return s, err
+}
diff --git a/vendor/github.com/d5/tengo/objects/map.go b/vendor/github.com/d5/tengo/objects/map.go
index c42ffe93..9208872c 100644
--- a/vendor/github.com/d5/tengo/objects/map.go
+++ b/vendor/github.com/d5/tengo/objects/map.go
@@ -76,13 +76,13 @@ func (o *Map) Equals(x Object) bool {
 
 // IndexGet returns the value for the given key.
 func (o *Map) IndexGet(index Object) (res Object, err error) {
-	strIdx, ok := index.(*String)
+	strIdx, ok := ToString(index)
 	if !ok {
 		err = ErrInvalidIndexType
 		return
 	}
 
-	val, ok := o.Value[strIdx.Value]
+	val, ok := o.Value[strIdx]
 	if !ok {
 		val = UndefinedValue
 	}
diff --git a/vendor/github.com/d5/tengo/objects/undefined.go b/vendor/github.com/d5/tengo/objects/undefined.go
index 79a380f5..0fdbc084 100644
--- a/vendor/github.com/d5/tengo/objects/undefined.go
+++ b/vendor/github.com/d5/tengo/objects/undefined.go
@@ -40,3 +40,23 @@ func (o *Undefined) Equals(x Object) bool {
 func (o *Undefined) IndexGet(index Object) (Object, error) {
 	return UndefinedValue, nil
 }
+
+// Iterate creates a map iterator.
+func (o *Undefined) Iterate() Iterator {
+	return o
+}
+
+// Next returns true if there are more elements to iterate.
+func (o *Undefined) Next() bool {
+	return false
+}
+
+// Key returns the key or index value of the current element.
+func (o *Undefined) Key() Object {
+	return o
+}
+
+// Value returns the value of the current element.
+func (o *Undefined) Value() Object {
+	return o
+}
diff --git a/vendor/github.com/d5/tengo/runtime/vm.go b/vendor/github.com/d5/tengo/runtime/vm.go
index dde52db5..07f6e530 100644
--- a/vendor/github.com/d5/tengo/runtime/vm.go
+++ b/vendor/github.com/d5/tengo/runtime/vm.go
@@ -642,9 +642,31 @@ func (v *VM) run() {
 
 			switch callee := value.(type) {
 			case *objects.Closure:
+				if callee.Fn.VarArgs {
+					// if the closure is variadic,
+					// roll up all variadic parameters into an array
+					realArgs := callee.Fn.NumParameters - 1
+					varArgs := numArgs - realArgs
+					if varArgs >= 0 {
+						numArgs = realArgs + 1
+						args := make([]objects.Object, varArgs)
+						spStart := v.sp - varArgs
+						for i := spStart; i < v.sp; i++ {
+							args[i-spStart] = v.stack[i]
+						}
+						v.stack[spStart] = &objects.Array{Value: args}
+						v.sp = spStart + 1
+					}
+				}
+
 				if numArgs != callee.Fn.NumParameters {
-					v.err = fmt.Errorf("wrong number of arguments: want=%d, got=%d",
-						callee.Fn.NumParameters, numArgs)
+					if callee.Fn.VarArgs {
+						v.err = fmt.Errorf("wrong number of arguments: want>=%d, got=%d",
+							callee.Fn.NumParameters-1, numArgs)
+					} else {
+						v.err = fmt.Errorf("wrong number of arguments: want=%d, got=%d",
+							callee.Fn.NumParameters, numArgs)
+					}
 					return
 				}
 
@@ -674,9 +696,31 @@ func (v *VM) run() {
 				v.sp = v.sp - numArgs + callee.Fn.NumLocals
 
 			case *objects.CompiledFunction:
+				if callee.VarArgs {
+					// if the closure is variadic,
+					// roll up all variadic parameters into an array
+					realArgs := callee.NumParameters - 1
+					varArgs := numArgs - realArgs
+					if varArgs >= 0 {
+						numArgs = realArgs + 1
+						args := make([]objects.Object, varArgs)
+						spStart := v.sp - varArgs
+						for i := spStart; i < v.sp; i++ {
+							args[i-spStart] = v.stack[i]
+						}
+						v.stack[spStart] = &objects.Array{Value: args}
+						v.sp = spStart + 1
+					}
+				}
+
 				if numArgs != callee.NumParameters {
-					v.err = fmt.Errorf("wrong number of arguments: want=%d, got=%d",
-						callee.NumParameters, numArgs)
+					if callee.VarArgs {
+						v.err = fmt.Errorf("wrong number of arguments: want>=%d, got=%d",
+							callee.NumParameters-1, numArgs)
+					} else {
+						v.err = fmt.Errorf("wrong number of arguments: want=%d, got=%d",
+							callee.NumParameters, numArgs)
+					}
 					return
 				}
 
@@ -707,9 +751,7 @@ func (v *VM) run() {
 
 			case objects.Callable:
 				var args []objects.Object
-				for _, arg := range v.stack[v.sp-numArgs : v.sp] {
-					args = append(args, arg)
-				}
+				args = append(args, v.stack[v.sp-numArgs:v.sp]...)
 
 				ret, e := callee.Call(args...)
 				v.sp -= numArgs + 1
@@ -817,9 +859,12 @@ func (v *VM) run() {
 			val := v.stack[v.sp-numSelectors-1]
 			v.sp -= numSelectors + 1
 
-			sp := v.curFrame.basePointer + localIndex
+			dst := v.stack[v.curFrame.basePointer+localIndex]
+			if obj, ok := dst.(*objects.ObjectPtr); ok {
+				dst = *obj.Value
+			}
 
-			if e := indexAssign(v.stack[sp], val, selectors); e != nil {
+			if e := indexAssign(dst, val, selectors); e != nil {
 				v.err = e
 				return
 			}
diff --git a/vendor/github.com/d5/tengo/script/script.go b/vendor/github.com/d5/tengo/script/script.go
index cdf36713..2ee67b61 100644
--- a/vendor/github.com/d5/tengo/script/script.go
+++ b/vendor/github.com/d5/tengo/script/script.go
@@ -183,12 +183,3 @@ func (s *Script) prepCompile() (symbolTable *compiler.SymbolTable, globals []obj
 
 	return
 }
-
-func (s *Script) copyVariables() map[string]*Variable {
-	vars := make(map[string]*Variable)
-	for n, v := range s.variables {
-		vars[n] = v
-	}
-
-	return vars
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/fmt.go b/vendor/github.com/d5/tengo/stdlib/fmt.go
index 9c75fc33..b8f64278 100644
--- a/vendor/github.com/d5/tengo/stdlib/fmt.go
+++ b/vendor/github.com/d5/tengo/stdlib/fmt.go
@@ -44,12 +44,12 @@ func fmtPrintf(args ...objects.Object) (ret objects.Object, err error) {
 		return nil, nil
 	}
 
-	formatArgs := make([]interface{}, numArgs-1, numArgs-1)
-	for idx, arg := range args[1:] {
-		formatArgs[idx] = objects.ToInterface(arg)
+	s, err := objects.Format(format.Value, args[1:]...)
+	if err != nil {
+		return nil, err
 	}
 
-	fmt.Printf(format.Value, formatArgs...)
+	fmt.Print(s)
 
 	return nil, nil
 }
@@ -84,15 +84,9 @@ func fmtSprintf(args ...objects.Object) (ret objects.Object, err error) {
 		return format, nil // okay to return 'format' directly as String is immutable
 	}
 
-	formatArgs := make([]interface{}, numArgs-1, numArgs-1)
-	for idx, arg := range args[1:] {
-		formatArgs[idx] = objects.ToInterface(arg)
-	}
-
-	s := fmt.Sprintf(format.Value, formatArgs...)
-
-	if len(s) > tengo.MaxStringLen {
-		return nil, objects.ErrStringLimit
+	s, err := objects.Format(format.Value, args[1:]...)
+	if err != nil {
+		return nil, err
 	}
 
 	return &objects.String{Value: s}, nil
diff --git a/vendor/github.com/d5/tengo/stdlib/text.go b/vendor/github.com/d5/tengo/stdlib/text.go
index 9f9770b8..4b5729ec 100644
--- a/vendor/github.com/d5/tengo/stdlib/text.go
+++ b/vendor/github.com/d5/tengo/stdlib/text.go
@@ -32,6 +32,7 @@ var textModule = map[string]objects.Object{
 	"last_index_any": &objects.UserFunction{Name: "last_index_any", Value: FuncASSRI(strings.LastIndexAny)}, // last_index_any(s, chars) => int
 	"repeat":         &objects.UserFunction{Name: "repeat", Value: textRepeat},                              // repeat(s, count) => string
 	"replace":        &objects.UserFunction{Name: "replace", Value: textReplace},                            // replace(s, old, new, n) => string
+	"substr":         &objects.UserFunction{Name: "substr", Value: textSubstring},                           // substr(s, lower, upper) => string
 	"split":          &objects.UserFunction{Name: "split", Value: FuncASSRSs(strings.Split)},                // split(s, sep) => [string]
 	"split_after":    &objects.UserFunction{Name: "split_after", Value: FuncASSRSs(strings.SplitAfter)},     // split_after(s, sep) => [string]
 	"split_after_n":  &objects.UserFunction{Name: "split_after_n", Value: FuncASSIRSs(strings.SplitAfterN)}, // split_after_n(s, sep, n) => [string]
@@ -40,6 +41,9 @@ var textModule = map[string]objects.Object{
 	"to_lower":       &objects.UserFunction{Name: "to_lower", Value: FuncASRS(strings.ToLower)},             // to_lower(s) => string
 	"to_title":       &objects.UserFunction{Name: "to_title", Value: FuncASRS(strings.ToTitle)},             // to_title(s) => string
 	"to_upper":       &objects.UserFunction{Name: "to_upper", Value: FuncASRS(strings.ToUpper)},             // to_upper(s) => string
+	"pad_left":       &objects.UserFunction{Name: "pad_left", Value: textPadLeft},                           // pad_left(s, pad_len, pad_with) => string
+	"pad_right":      &objects.UserFunction{Name: "pad_right", Value: textPadRight},                         // pad_right(s, pad_len, pad_with) => string
+	"trim":           &objects.UserFunction{Name: "trim", Value: FuncASSRS(strings.Trim)},                   // trim(s, cutset) => string
 	"trim_left":      &objects.UserFunction{Name: "trim_left", Value: FuncASSRS(strings.TrimLeft)},          // trim_left(s, cutset) => string
 	"trim_prefix":    &objects.UserFunction{Name: "trim_prefix", Value: FuncASSRS(strings.TrimPrefix)},      // trim_prefix(s, prefix) => string
 	"trim_right":     &objects.UserFunction{Name: "trim_right", Value: FuncASSRS(strings.TrimRight)},        // trim_right(s, cutset) => string
@@ -376,6 +380,195 @@ func textReplace(args ...objects.Object) (ret objects.Object, err error) {
 	return
 }
 
+func textSubstring(args ...objects.Object) (ret objects.Object, err error) {
+	argslen := len(args)
+	if argslen != 2 && argslen != 3 {
+		err = objects.ErrWrongNumArguments
+		return
+	}
+
+	s1, ok := objects.ToString(args[0])
+	if !ok {
+		err = objects.ErrInvalidArgumentType{
+			Name:     "first",
+			Expected: "string(compatible)",
+			Found:    args[0].TypeName(),
+		}
+		return
+	}
+
+	i2, ok := objects.ToInt(args[1])
+	if !ok {
+		err = objects.ErrInvalidArgumentType{
+			Name:     "second",
+			Expected: "int(compatible)",
+			Found:    args[1].TypeName(),
+		}
+		return
+	}
+
+	strlen := len(s1)
+	i3 := strlen
+	if argslen == 3 {
+		i3, ok = objects.ToInt(args[2])
+		if !ok {
+			err = objects.ErrInvalidArgumentType{
+				Name:     "third",
+				Expected: "int(compatible)",
+				Found:    args[2].TypeName(),
+			}
+			return
+		}
+	}
+
+	if i2 > i3 {
+		err = objects.ErrInvalidIndexType
+		return
+	}
+
+	if i2 < 0 {
+		i2 = 0
+	} else if i2 > strlen {
+		i2 = strlen
+	}
+
+	if i3 < 0 {
+		i3 = 0
+	} else if i3 > strlen {
+		i3 = strlen
+	}
+
+	ret = &objects.String{Value: s1[i2:i3]}
+
+	return
+}
+
+func textPadLeft(args ...objects.Object) (ret objects.Object, err error) {
+	argslen := len(args)
+	if argslen != 2 && argslen != 3 {
+		err = objects.ErrWrongNumArguments
+		return
+	}
+
+	s1, ok := objects.ToString(args[0])
+	if !ok {
+		err = objects.ErrInvalidArgumentType{
+			Name:     "first",
+			Expected: "string(compatible)",
+			Found:    args[0].TypeName(),
+		}
+		return
+	}
+
+	i2, ok := objects.ToInt(args[1])
+	if !ok {
+		err = objects.ErrInvalidArgumentType{
+			Name:     "second",
+			Expected: "int(compatible)",
+			Found:    args[1].TypeName(),
+		}
+		return
+	}
+
+	if i2 > tengo.MaxStringLen {
+		return nil, objects.ErrStringLimit
+	}
+
+	sLen := len(s1)
+	if sLen >= i2 {
+		ret = &objects.String{Value: s1}
+		return
+	}
+
+	s3 := " "
+	if argslen == 3 {
+		s3, ok = objects.ToString(args[2])
+		if !ok {
+			err = objects.ErrInvalidArgumentType{
+				Name:     "third",
+				Expected: "string(compatible)",
+				Found:    args[2].TypeName(),
+			}
+			return
+		}
+	}
+
+	padStrLen := len(s3)
+	if padStrLen == 0 {
+		ret = &objects.String{Value: s1}
+		return
+	}
+
+	padCount := ((i2 - padStrLen) / padStrLen) + 1
+	retStr := strings.Repeat(s3, int(padCount)) + s1
+	ret = &objects.String{Value: retStr[len(retStr)-i2:]}
+
+	return
+}
+
+func textPadRight(args ...objects.Object) (ret objects.Object, err error) {
+	argslen := len(args)
+	if argslen != 2 && argslen != 3 {
+		err = objects.ErrWrongNumArguments
+		return
+	}
+
+	s1, ok := objects.ToString(args[0])
+	if !ok {
+		err = objects.ErrInvalidArgumentType{
+			Name:     "first",
+			Expected: "string(compatible)",
+			Found:    args[0].TypeName(),
+		}
+		return
+	}
+
+	i2, ok := objects.ToInt(args[1])
+	if !ok {
+		err = objects.ErrInvalidArgumentType{
+			Name:     "second",
+			Expected: "int(compatible)",
+			Found:    args[1].TypeName(),
+		}
+		return
+	}
+
+	if i2 > tengo.MaxStringLen {
+		return nil, objects.ErrStringLimit
+	}
+
+	sLen := len(s1)
+	if sLen >= i2 {
+		ret = &objects.String{Value: s1}
+		return
+	}
+
+	s3 := " "
+	if argslen == 3 {
+		s3, ok = objects.ToString(args[2])
+		if !ok {
+			err = objects.ErrInvalidArgumentType{
+				Name:     "third",
+				Expected: "string(compatible)",
+				Found:    args[2].TypeName(),
+			}
+			return
+		}
+	}
+
+	padStrLen := len(s3)
+	if padStrLen == 0 {
+		ret = &objects.String{Value: s1}
+		return
+	}
+
+	padCount := ((i2 - padStrLen) / padStrLen) + 1
+	retStr := s1 + strings.Repeat(s3, int(padCount))
+	ret = &objects.String{Value: retStr[:i2]}
+
+	return
+}
+
 func textRepeat(args ...objects.Object) (ret objects.Object, err error) {
 	if len(args) != 2 {
 		return nil, objects.ErrWrongNumArguments
diff --git a/vendor/github.com/gorilla/schema/README.md b/vendor/github.com/gorilla/schema/README.md
index 2c3ecd8e..aefdd669 100644
--- a/vendor/github.com/gorilla/schema/README.md
+++ b/vendor/github.com/gorilla/schema/README.md
@@ -11,7 +11,7 @@ Package gorilla/schema converts structs to and from form values.
 Here's a quick example: we parse POST form values and then decode them into a struct:
 
 ```go
-// Set a Decoder instance as a package global, because it caches 
+// Set a Decoder instance as a package global, because it caches
 // meta-data about structs, and an instance can be shared safely.
 var decoder = schema.NewDecoder()
 
@@ -27,9 +27,9 @@ func MyHandler(w http.ResponseWriter, r *http.Request) {
     }
 
     var person Person
-    
+
     // r.PostForm is a map of our POST form values
-    err := decoder.Decode(&person, r.PostForm)
+    err = decoder.Decode(&person, r.PostForm)
     if err != nil {
         // Handle error
     }
@@ -64,9 +64,9 @@ To define custom names for fields, use a struct tag "schema". To not populate ce
 
 ```go
 type Person struct {
-    Name  string `schema:"name"`  // custom name
-    Phone string `schema:"phone"` // custom name
-    Admin bool   `schema:"-"`     // this field is never set
+    Name  string `schema:"name,required"`  // custom name, must be supplied
+    Phone string `schema:"phone"`          // custom name
+    Admin bool   `schema:"-"`              // this field is never set
 }
 ```
 
@@ -83,8 +83,8 @@ The supported field types in the struct are:
 
 Unsupported types are simply ignored, however custom types can be registered to be converted.
 
-More examples are available on the Gorilla website: http://www.gorillatoolkit.org/pkg/schema
+More examples are available on the Gorilla website: https://www.gorillatoolkit.org/pkg/schema
 
-## License 
+## License
 
 BSD licensed. See the LICENSE file for details.
diff --git a/vendor/github.com/gorilla/schema/cache.go b/vendor/github.com/gorilla/schema/cache.go
index 73b75f48..0746c120 100644
--- a/vendor/github.com/gorilla/schema/cache.go
+++ b/vendor/github.com/gorilla/schema/cache.go
@@ -117,7 +117,7 @@ func (c *cache) get(t reflect.Type) *structInfo {
 	info := c.m[t]
 	c.l.RUnlock()
 	if info == nil {
-		info = c.create(t, nil)
+		info = c.create(t, "")
 		c.l.Lock()
 		c.m[t] = info
 		c.l.Unlock()
@@ -126,37 +126,40 @@ func (c *cache) get(t reflect.Type) *structInfo {
 }
 
 // create creates a structInfo with meta-data about a struct.
-func (c *cache) create(t reflect.Type, info *structInfo) *structInfo {
-	if info == nil {
-		info = &structInfo{fields: []*fieldInfo{}}
-	}
+func (c *cache) create(t reflect.Type, parentAlias string) *structInfo {
+	info := &structInfo{}
+	var anonymousInfos []*structInfo
 	for i := 0; i < t.NumField(); i++ {
-		field := t.Field(i)
-		if field.Anonymous {
-			ft := field.Type
-			if ft.Kind() == reflect.Ptr {
-				ft = ft.Elem()
+		if f := c.createField(t.Field(i), parentAlias); f != nil {
+			info.fields = append(info.fields, f)
+			if ft := indirectType(f.typ); ft.Kind() == reflect.Struct && f.isAnonymous {
+				anonymousInfos = append(anonymousInfos, c.create(ft, f.canonicalAlias))
 			}
-			if ft.Kind() == reflect.Struct {
-				bef := len(info.fields)
-				c.create(ft, info)
-				for _, fi := range info.fields[bef:len(info.fields)] {
-					// exclude required check because duplicated to embedded field
-					fi.isRequired = false
-				}
+		}
+	}
+	for i, a := range anonymousInfos {
+		others := []*structInfo{info}
+		others = append(others, anonymousInfos[:i]...)
+		others = append(others, anonymousInfos[i+1:]...)
+		for _, f := range a.fields {
+			if !containsAlias(others, f.alias) {
+				info.fields = append(info.fields, f)
 			}
 		}
-		c.createField(field, info)
 	}
 	return info
 }
 
 // createField creates a fieldInfo for the given field.
-func (c *cache) createField(field reflect.StructField, info *structInfo) {
+func (c *cache) createField(field reflect.StructField, parentAlias string) *fieldInfo {
 	alias, options := fieldAlias(field, c.tag)
 	if alias == "-" {
 		// Ignore this field.
-		return
+		return nil
+	}
+	canonicalAlias := alias
+	if parentAlias != "" {
+		canonicalAlias = parentAlias + "." + alias
 	}
 	// Check if the type is supported and don't cache it if not.
 	// First let's get the basic type.
@@ -181,19 +184,20 @@ func (c *cache) createField(field reflect.StructField, info *structInfo) {
 	if isStruct = ft.Kind() == reflect.Struct; !isStruct {
 		if c.converter(ft) == nil && builtinConverters[ft.Kind()] == nil {
 			// Type is not supported.
-			return
+			return nil
 		}
 	}
 
-	info.fields = append(info.fields, &fieldInfo{
+	return &fieldInfo{
 		typ:              field.Type,
 		name:             field.Name,
 		alias:            alias,
+		canonicalAlias:   canonicalAlias,
 		unmarshalerInfo:  m,
 		isSliceOfStructs: isSlice && isStruct,
 		isAnonymous:      field.Anonymous,
 		isRequired:       options.Contains("required"),
-	})
+	}
 }
 
 // converter returns the converter for a type.
@@ -216,11 +220,26 @@ func (i *structInfo) get(alias string) *fieldInfo {
 	return nil
 }
 
+func containsAlias(infos []*structInfo, alias string) bool {
+	for _, info := range infos {
+		if info.get(alias) != nil {
+			return true
+		}
+	}
+	return false
+}
+
 type fieldInfo struct {
 	typ reflect.Type
 	// name is the field name in the struct.
 	name  string
 	alias string
+	// canonicalAlias is almost the same as the alias, but is prefixed with
+	// an embedded struct field alias in dotted notation if this field is
+	// promoted from the struct.
+	// For instance, if the alias is "N" and this field is an embedded field
+	// in a struct "X", canonicalAlias will be "X.N".
+	canonicalAlias string
 	// unmarshalerInfo contains information regarding the
 	// encoding.TextUnmarshaler implementation of the field type.
 	unmarshalerInfo unmarshaler
@@ -231,6 +250,13 @@ type fieldInfo struct {
 	isRequired  bool
 }
 
+func (f *fieldInfo) paths(prefix string) []string {
+	if f.alias == f.canonicalAlias {
+		return []string{prefix + f.alias}
+	}
+	return []string{prefix + f.alias, prefix + f.canonicalAlias}
+}
+
 type pathPart struct {
 	field *fieldInfo
 	path  []string // path to the field: walks structs using field names.
@@ -239,6 +265,13 @@ type pathPart struct {
 
 // ----------------------------------------------------------------------------
 
+func indirectType(typ reflect.Type) reflect.Type {
+	if typ.Kind() == reflect.Ptr {
+		return typ.Elem()
+	}
+	return typ
+}
+
 // fieldAlias parses a field tag to get a field alias.
 func fieldAlias(field reflect.StructField, tagName string) (alias string, options tagOptions) {
 	if tag := field.Tag.Get(tagName); tag != "" {
diff --git a/vendor/github.com/gorilla/schema/decoder.go b/vendor/github.com/gorilla/schema/decoder.go
index 5352a908..5afbd921 100644
--- a/vendor/github.com/gorilla/schema/decoder.go
+++ b/vendor/github.com/gorilla/schema/decoder.go
@@ -81,52 +81,83 @@ func (d *Decoder) Decode(dst interface{}, src map[string][]string) error {
 				errors[path] = err
 			}
 		} else if !d.ignoreUnknownKeys {
-			errors[path] = fmt.Errorf("schema: invalid path %q", path)
+			errors[path] = UnknownKeyError{Key: path}
 		}
 	}
+	errors.merge(d.checkRequired(t, src))
 	if len(errors) > 0 {
 		return errors
 	}
-	return d.checkRequired(t, src, "")
+	return nil
 }
 
 // checkRequired checks whether required fields are empty
 //
-// check type t recursively if t has struct fields, and prefix is same as parsePath: in dotted notation
+// check type t recursively if t has struct fields.
 //
 // src is the source map for decoding, we use it here to see if those required fields are included in src
-func (d *Decoder) checkRequired(t reflect.Type, src map[string][]string, prefix string) error {
+func (d *Decoder) checkRequired(t reflect.Type, src map[string][]string) MultiError {
+	m, errs := d.findRequiredFields(t, "", "")
+	for key, fields := range m {
+		if isEmptyFields(fields, src) {
+			errs[key] = EmptyFieldError{Key: key}
+		}
+	}
+	return errs
+}
+
+// findRequiredFields recursively searches the struct type t for required fields.
+//
+// canonicalPrefix and searchPrefix are used to resolve full paths in dotted notation
+// for nested struct fields. canonicalPrefix is a complete path which never omits
+// any embedded struct fields. searchPrefix is a user-friendly path which may omit
+// some embedded struct fields to point promoted fields.
+func (d *Decoder) findRequiredFields(t reflect.Type, canonicalPrefix, searchPrefix string) (map[string][]fieldWithPrefix, MultiError) {
 	struc := d.cache.get(t)
 	if struc == nil {
 		// unexpect, cache.get never return nil
-		return errors.New("cache fail")
+		return nil, MultiError{canonicalPrefix + "*": errors.New("cache fail")}
 	}
 
+	m := map[string][]fieldWithPrefix{}
+	errs := MultiError{}
 	for _, f := range struc.fields {
 		if f.typ.Kind() == reflect.Struct {
-			err := d.checkRequired(f.typ, src, prefix+f.alias+".")
-			if err != nil {
-				if !f.isAnonymous {
-					return err
-				}
-				// check embedded parent field.
-				err2 := d.checkRequired(f.typ, src, prefix)
-				if err2 != nil {
-					return err
+			fcprefix := canonicalPrefix + f.canonicalAlias + "."
+			for _, fspath := range f.paths(searchPrefix) {
+				fm, ferrs := d.findRequiredFields(f.typ, fcprefix, fspath+".")
+				for key, fields := range fm {
+					m[key] = append(m[key], fields...)
 				}
+				errs.merge(ferrs)
 			}
 		}
 		if f.isRequired {
-			key := f.alias
-			if prefix != "" {
-				key = prefix + key
-			}
-			if isEmpty(f.typ, src[key]) {
-				return fmt.Errorf("%v is empty", key)
+			key := canonicalPrefix + f.canonicalAlias
+			m[key] = append(m[key], fieldWithPrefix{
+				fieldInfo: f,
+				prefix:    searchPrefix,
+			})
+		}
+	}
+	return m, errs
+}
+
+type fieldWithPrefix struct {
+	*fieldInfo
+	prefix string
+}
+
+// isEmptyFields returns true if all of specified fields are empty.
+func isEmptyFields(fields []fieldWithPrefix, src map[string][]string) bool {
+	for _, f := range fields {
+		for _, path := range f.paths(f.prefix) {
+			if !isEmpty(f.typ, src[path]) {
+				return false
 			}
 		}
 	}
-	return nil
+	return true
 }
 
 // isEmpty returns true if value is empty for specific type
@@ -424,6 +455,24 @@ func (e ConversionError) Error() string {
 	return output
 }
 
+// UnknownKeyError stores information about an unknown key in the source map.
+type UnknownKeyError struct {
+	Key string // key from the source map.
+}
+
+func (e UnknownKeyError) Error() string {
+	return fmt.Sprintf("schema: invalid path %q", e.Key)
+}
+
+// EmptyFieldError stores information about an empty required field.
+type EmptyFieldError struct {
+	Key string // required key in the source map.
+}
+
+func (e EmptyFieldError) Error() string {
+	return fmt.Sprintf("%v is empty", e.Key)
+}
+
 // MultiError stores multiple decoding errors.
 //
 // Borrowed from the App Engine SDK.
@@ -445,3 +494,11 @@ func (e MultiError) Error() string {
 	}
 	return fmt.Sprintf("%s (and %d other errors)", s, len(e)-1)
 }
+
+func (e MultiError) merge(errors MultiError) {
+	for key, err := range errors {
+		if e[key] == nil {
+			e[key] = err
+		}
+	}
+}
diff --git a/vendor/github.com/hashicorp/golang-lru/lru.go b/vendor/github.com/hashicorp/golang-lru/lru.go
index c8d9b0a2..1cbe04b7 100644
--- a/vendor/github.com/hashicorp/golang-lru/lru.go
+++ b/vendor/github.com/hashicorp/golang-lru/lru.go
@@ -40,31 +40,35 @@ func (c *Cache) Purge() {
 // Add adds a value to the cache.  Returns true if an eviction occurred.
 func (c *Cache) Add(key, value interface{}) (evicted bool) {
 	c.lock.Lock()
-	defer c.lock.Unlock()
-	return c.lru.Add(key, value)
+	evicted = c.lru.Add(key, value)
+	c.lock.Unlock()
+	return evicted
 }
 
 // Get looks up a key's value from the cache.
 func (c *Cache) Get(key interface{}) (value interface{}, ok bool) {
 	c.lock.Lock()
-	defer c.lock.Unlock()
-	return c.lru.Get(key)
+	value, ok = c.lru.Get(key)
+	c.lock.Unlock()
+	return value, ok
 }
 
 // Contains checks if a key is in the cache, without updating the
 // recent-ness or deleting it for being stale.
 func (c *Cache) Contains(key interface{}) bool {
 	c.lock.RLock()
-	defer c.lock.RUnlock()
-	return c.lru.Contains(key)
+	containKey := c.lru.Contains(key)
+	c.lock.RUnlock()
+	return containKey
 }
 
 // Peek returns the key value (or undefined if not found) without updating
 // the "recently used"-ness of the key.
 func (c *Cache) Peek(key interface{}) (value interface{}, ok bool) {
 	c.lock.RLock()
-	defer c.lock.RUnlock()
-	return c.lru.Peek(key)
+	value, ok = c.lru.Peek(key)
+	c.lock.RUnlock()
+	return value, ok
 }
 
 // ContainsOrAdd checks if a key is in the cache  without updating the
@@ -98,13 +102,15 @@ func (c *Cache) RemoveOldest() {
 // Keys returns a slice of the keys in the cache, from oldest to newest.
 func (c *Cache) Keys() []interface{} {
 	c.lock.RLock()
-	defer c.lock.RUnlock()
-	return c.lru.Keys()
+	keys := c.lru.Keys()
+	c.lock.RUnlock()
+	return keys
 }
 
 // Len returns the number of items in the cache.
 func (c *Cache) Len() int {
 	c.lock.RLock()
-	defer c.lock.RUnlock()
-	return c.lru.Len()
+	length := c.lru.Len()
+	c.lock.RUnlock()
+	return length
 }
diff --git a/vendor/github.com/labstack/echo/v4/.travis.yml b/vendor/github.com/labstack/echo/v4/.travis.yml
index 30346d7f..3897356d 100644
--- a/vendor/github.com/labstack/echo/v4/.travis.yml
+++ b/vendor/github.com/labstack/echo/v4/.travis.yml
@@ -1,6 +1,7 @@
 language: go
 go:
   - 1.11.x
+  - 1.12.x
   - tip
 env:
   - GO111MODULE=on
diff --git a/vendor/github.com/labstack/echo/v4/README.md b/vendor/github.com/labstack/echo/v4/README.md
index 1db5e356..0da03122 100644
--- a/vendor/github.com/labstack/echo/v4/README.md
+++ b/vendor/github.com/labstack/echo/v4/README.md
@@ -56,30 +56,29 @@ Lower is better!
 package main
 
 import (
-	"net/http"
-
-	"github.com/labstack/echo/v4"
-	"github.com/labstack/echo/v4/middleware"
+  "net/http"
+  "github.com/labstack/echo/v4"
+  "github.com/labstack/echo/v4/middleware"
 )
 
 func main() {
-	// Echo instance
-	e := echo.New()
+  // Echo instance
+  e := echo.New()
 
-	// Middleware
-	e.Use(middleware.Logger())
-	e.Use(middleware.Recover())
+  // Middleware
+  e.Use(middleware.Logger())
+  e.Use(middleware.Recover())
 
-	// Routes
-	e.GET("/", hello)
+  // Routes
+  e.GET("/", hello)
 
-	// Start server
-	e.Logger.Fatal(e.Start(":1323"))
+  // Start server
+  e.Logger.Fatal(e.Start(":1323"))
 }
 
 // Handler
 func hello(c echo.Context) error {
-	return c.String(http.StatusOK, "Hello, World!")
+  return c.String(http.StatusOK, "Hello, World!")
 }
 ```
 
diff --git a/vendor/github.com/labstack/echo/v4/bind.go b/vendor/github.com/labstack/echo/v4/bind.go
index cb65ed2d..07d8034c 100644
--- a/vendor/github.com/labstack/echo/v4/bind.go
+++ b/vendor/github.com/labstack/echo/v4/bind.go
@@ -1,6 +1,7 @@
 package echo
 
 import (
+	"encoding"
 	"encoding/json"
 	"encoding/xml"
 	"errors"
@@ -21,6 +22,8 @@ type (
 	DefaultBinder struct{}
 
 	// BindUnmarshaler is the interface used to wrap the UnmarshalParam method.
+	// Types that don't implement this, but do implement encoding.TextUnmarshaler
+	// will use that interface instead.
 	BindUnmarshaler interface {
 		// UnmarshalParam decodes and assigns a value from an form or query param.
 		UnmarshalParam(param string) error
@@ -211,12 +214,30 @@ func bindUnmarshaler(field reflect.Value) (BindUnmarshaler, bool) {
 	return nil, false
 }
 
+// textUnmarshaler attempts to unmarshal a reflect.Value into a TextUnmarshaler
+func textUnmarshaler(field reflect.Value) (encoding.TextUnmarshaler, bool) {
+	ptr := reflect.New(field.Type())
+	if ptr.CanInterface() {
+		iface := ptr.Interface()
+		if unmarshaler, ok := iface.(encoding.TextUnmarshaler); ok {
+			return unmarshaler, ok
+		}
+	}
+	return nil, false
+}
+
 func unmarshalFieldNonPtr(value string, field reflect.Value) (bool, error) {
 	if unmarshaler, ok := bindUnmarshaler(field); ok {
 		err := unmarshaler.UnmarshalParam(value)
 		field.Set(reflect.ValueOf(unmarshaler).Elem())
 		return true, err
 	}
+	if unmarshaler, ok := textUnmarshaler(field); ok {
+		err := unmarshaler.UnmarshalText([]byte(value))
+		field.Set(reflect.ValueOf(unmarshaler).Elem())
+		return true, err
+	}
+
 	return false, nil
 }
 
diff --git a/vendor/github.com/labstack/echo/v4/context.go b/vendor/github.com/labstack/echo/v4/context.go
index d4722700..065f5815 100644
--- a/vendor/github.com/labstack/echo/v4/context.go
+++ b/vendor/github.com/labstack/echo/v4/context.go
@@ -13,6 +13,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 )
 
 type (
@@ -198,6 +199,7 @@ type (
 		handler  HandlerFunc
 		store    Map
 		echo     *Echo
+		lock     sync.RWMutex
 	}
 )
 
@@ -232,7 +234,7 @@ func (c *context) IsTLS() bool {
 
 func (c *context) IsWebSocket() bool {
 	upgrade := c.request.Header.Get(HeaderUpgrade)
-	return upgrade == "websocket" || upgrade == "Websocket"
+	return strings.ToLower(upgrade) == "websocket"
 }
 
 func (c *context) Scheme() string {
@@ -360,10 +362,15 @@ func (c *context) Cookies() []*http.Cookie {
 }
 
 func (c *context) Get(key string) interface{} {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
 	return c.store[key]
 }
 
 func (c *context) Set(key string, val interface{}) {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
 	if c.store == nil {
 		c.store = make(Map)
 	}
@@ -430,7 +437,7 @@ func (c *context) json(code int, i interface{}, indent string) error {
 		enc.SetIndent("", indent)
 	}
 	c.writeContentType(MIMEApplicationJSONCharsetUTF8)
-	c.response.WriteHeader(code)
+	c.response.Status = code
 	return enc.Encode(i)
 }
 
@@ -597,4 +604,3 @@ func (c *context) Reset(r *http.Request, w http.ResponseWriter) {
 	// NOTE: Don't reset because it has to have length c.echo.maxParam at all times
 	// c.pvalues = nil
 }
-
diff --git a/vendor/github.com/labstack/echo/v4/echo.go b/vendor/github.com/labstack/echo/v4/echo.go
index 0fe6880f..56b2cf8c 100644
--- a/vendor/github.com/labstack/echo/v4/echo.go
+++ b/vendor/github.com/labstack/echo/v4/echo.go
@@ -43,6 +43,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	stdLog "log"
 	"net"
 	"net/http"
@@ -56,18 +57,21 @@ import (
 
 	"github.com/labstack/gommon/color"
 	"github.com/labstack/gommon/log"
+	"golang.org/x/crypto/acme"
 	"golang.org/x/crypto/acme/autocert"
 )
 
 type (
 	// Echo is the top-level framework instance.
 	Echo struct {
+		common
 		StdLogger        *stdLog.Logger
 		colorer          *color.Color
 		premiddleware    []MiddlewareFunc
 		middleware       []MiddlewareFunc
 		maxParam         *int
 		router           *Router
+		routers          map[string]*Router
 		notFoundHandler  HandlerFunc
 		pool             sync.Pool
 		Server           *http.Server
@@ -122,10 +126,8 @@ type (
 	// Map defines a generic map of type `map[string]interface{}`.
 	Map map[string]interface{}
 
-	// i is the interface for Echo and Group.
-	i interface {
-		GET(string, HandlerFunc, ...MiddlewareFunc) *Route
-	}
+	// Common struct for Echo & Group.
+	common struct{}
 )
 
 // HTTP methods
@@ -168,6 +170,8 @@ const (
 	charsetUTF8 = "charset=UTF-8"
 	// PROPFIND Method can be used on collection and property resources.
 	PROPFIND = "PROPFIND"
+	// REPORT Method can be used to get information about a resource, see rfc 3253
+	REPORT = "REPORT"
 )
 
 // Headers
@@ -211,17 +215,18 @@ const (
 	HeaderAccessControlMaxAge           = "Access-Control-Max-Age"
 
 	// Security
-	HeaderStrictTransportSecurity = "Strict-Transport-Security"
-	HeaderXContentTypeOptions     = "X-Content-Type-Options"
-	HeaderXXSSProtection          = "X-XSS-Protection"
-	HeaderXFrameOptions           = "X-Frame-Options"
-	HeaderContentSecurityPolicy   = "Content-Security-Policy"
-	HeaderXCSRFToken              = "X-CSRF-Token"
+	HeaderStrictTransportSecurity         = "Strict-Transport-Security"
+	HeaderXContentTypeOptions             = "X-Content-Type-Options"
+	HeaderXXSSProtection                  = "X-XSS-Protection"
+	HeaderXFrameOptions                   = "X-Frame-Options"
+	HeaderContentSecurityPolicy           = "Content-Security-Policy"
+	HeaderContentSecurityPolicyReportOnly = "Content-Security-Policy-Report-Only"
+	HeaderXCSRFToken                      = "X-CSRF-Token"
 )
 
 const (
 	// Version of Echo
-	Version = "4.0.0"
+	Version = "4.1.5"
 	website = "https://echo.labstack.com"
 	// http://patorjk.com/software/taag/#p=display&f=Small%20Slant&t=Echo
 	banner = `
@@ -248,6 +253,7 @@ var (
 		PROPFIND,
 		http.MethodPut,
 		http.MethodTrace,
+		REPORT,
 	}
 )
 
@@ -269,6 +275,7 @@ var (
 	ErrRendererNotRegistered       = errors.New("renderer not registered")
 	ErrInvalidRedirectCode         = errors.New("invalid redirect status code")
 	ErrCookieNotFound              = errors.New("cookie not found")
+	ErrInvalidCertOrKeyType        = errors.New("invalid cert or key type, must be string or []byte")
 )
 
 // Error handlers
@@ -304,6 +311,7 @@ func New() (e *Echo) {
 		return e.NewContext(nil, nil)
 	}
 	e.router = NewRouter(e)
+	e.routers = map[string]*Router{}
 	return
 }
 
@@ -319,11 +327,16 @@ func (e *Echo) NewContext(r *http.Request, w http.ResponseWriter) Context {
 	}
 }
 
-// Router returns router.
+// Router returns the default router.
 func (e *Echo) Router() *Router {
 	return e.router
 }
 
+// Routers returns the map of host => router.
+func (e *Echo) Routers() map[string]*Router {
+	return e.routers
+}
+
 // DefaultHTTPErrorHandler is the default HTTP error handler. It sends a JSON response
 // with status code.
 func (e *Echo) DefaultHTTPErrorHandler(err error, c Context) {
@@ -450,10 +463,10 @@ func (e *Echo) Static(prefix, root string) *Route {
 	if root == "" {
 		root = "." // For security we want to restrict to CWD.
 	}
-	return static(e, prefix, root)
+	return e.static(prefix, root, e.GET)
 }
 
-func static(i i, prefix, root string) *Route {
+func (common) static(prefix, root string, get func(string, HandlerFunc, ...MiddlewareFunc) *Route) *Route {
 	h := func(c Context) error {
 		p, err := url.PathUnescape(c.Param("*"))
 		if err != nil {
@@ -462,26 +475,28 @@ func static(i i, prefix, root string) *Route {
 		name := filepath.Join(root, path.Clean("/"+p)) // "/"+ for security
 		return c.File(name)
 	}
-	i.GET(prefix, h)
 	if prefix == "/" {
-		return i.GET(prefix+"*", h)
+		return get(prefix+"*", h)
 	}
+	return get(prefix+"/*", h)
+}
 
-	return i.GET(prefix+"/*", h)
+func (common) file(path, file string, get func(string, HandlerFunc, ...MiddlewareFunc) *Route,
+	m ...MiddlewareFunc) *Route {
+	return get(path, func(c Context) error {
+		return c.File(file)
+	}, m...)
 }
 
 // File registers a new route with path to serve a static file with optional route-level middleware.
 func (e *Echo) File(path, file string, m ...MiddlewareFunc) *Route {
-	return e.GET(path, func(c Context) error {
-		return c.File(file)
-	}, m...)
+	return e.file(path, file, e.GET, m...)
 }
 
-// Add registers a new route for an HTTP method and path with matching handler
-// in the router with optional route-level middleware.
-func (e *Echo) Add(method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) *Route {
+func (e *Echo) add(host, method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) *Route {
 	name := handlerName(handler)
-	e.router.Add(method, path, func(c Context) error {
+	router := e.findRouter(host)
+	router.Add(method, path, func(c Context) error {
 		h := handler
 		// Chain middleware
 		for i := len(middleware) - 1; i >= 0; i-- {
@@ -498,6 +513,20 @@ func (e *Echo) Add(method, path string, handler HandlerFunc, middleware ...Middl
 	return r
 }
 
+// Add registers a new route for an HTTP method and path with matching handler
+// in the router with optional route-level middleware.
+func (e *Echo) Add(method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) *Route {
+	return e.add("", method, path, handler, middleware...)
+}
+
+// Host creates a new router group for the provided host and optional host-level middleware.
+func (e *Echo) Host(name string, m ...MiddlewareFunc) (g *Group) {
+	e.routers[name] = NewRouter(e)
+	g = &Group{host: name, echo: e}
+	g.Use(m...)
+	return
+}
+
 // Group creates a new router group with prefix and optional group-level middleware.
 func (e *Echo) Group(prefix string, m ...MiddlewareFunc) (g *Group) {
 	g = &Group{prefix: prefix, echo: e}
@@ -570,23 +599,17 @@ func (e *Echo) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	h := NotFoundHandler
 
 	if e.premiddleware == nil {
-		e.router.Find(r.Method, getPath(r), c)
+		e.findRouter(r.Host).Find(r.Method, getPath(r), c)
 		h = c.Handler()
-		for i := len(e.middleware) - 1; i >= 0; i-- {
-			h = e.middleware[i](h)
-		}
+		h = applyMiddleware(h, e.middleware...)
 	} else {
 		h = func(c Context) error {
-			e.router.Find(r.Method, getPath(r), c)
+			e.findRouter(r.Host).Find(r.Method, getPath(r), c)
 			h := c.Handler()
-			for i := len(e.middleware) - 1; i >= 0; i-- {
-				h = e.middleware[i](h)
-			}
+			h = applyMiddleware(h, e.middleware...)
 			return h(c)
 		}
-		for i := len(e.premiddleware) - 1; i >= 0; i-- {
-			h = e.premiddleware[i](h)
-		}
+		h = applyMiddleware(h, e.premiddleware...)
 	}
 
 	// Execute chain
@@ -605,25 +628,46 @@ func (e *Echo) Start(address string) error {
 }
 
 // StartTLS starts an HTTPS server.
-func (e *Echo) StartTLS(address string, certFile, keyFile string) (err error) {
-	if certFile == "" || keyFile == "" {
-		return errors.New("invalid tls configuration")
+// If `certFile` or `keyFile` is `string` the values are treated as file paths.
+// If `certFile` or `keyFile` is `[]byte` the values are treated as the certificate or key as-is.
+func (e *Echo) StartTLS(address string, certFile, keyFile interface{}) (err error) {
+	var cert []byte
+	if cert, err = filepathOrContent(certFile); err != nil {
+		return
+	}
+
+	var key []byte
+	if key, err = filepathOrContent(keyFile); err != nil {
+		return
 	}
+
 	s := e.TLSServer
 	s.TLSConfig = new(tls.Config)
 	s.TLSConfig.Certificates = make([]tls.Certificate, 1)
-	s.TLSConfig.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
-	if err != nil {
+	if s.TLSConfig.Certificates[0], err = tls.X509KeyPair(cert, key); err != nil {
 		return
 	}
+
 	return e.startTLS(address)
 }
 
+func filepathOrContent(fileOrContent interface{}) (content []byte, err error) {
+	switch v := fileOrContent.(type) {
+	case string:
+		return ioutil.ReadFile(v)
+	case []byte:
+		return v, nil
+	default:
+		return nil, ErrInvalidCertOrKeyType
+	}
+}
+
 // StartAutoTLS starts an HTTPS server using certificates automatically installed from https://letsencrypt.org.
 func (e *Echo) StartAutoTLS(address string) error {
 	s := e.TLSServer
 	s.TLSConfig = new(tls.Config)
 	s.TLSConfig.GetCertificate = e.AutoTLSManager.GetCertificate
+	s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, acme.ALPNProto)
 	return e.startTLS(address)
 }
 
@@ -742,6 +786,15 @@ func getPath(r *http.Request) string {
 	return path
 }
 
+func (e *Echo) findRouter(host string) *Router {
+	if len(e.routers) > 0 {
+		if r, ok := e.routers[host]; ok {
+			return r
+		}
+	}
+	return e.router
+}
+
 func handlerName(h HandlerFunc) string {
 	t := reflect.ValueOf(h).Type()
 	if t.Kind() == reflect.Func {
@@ -764,13 +817,14 @@ type tcpKeepAliveListener struct {
 }
 
 func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
-	tc, err := ln.AcceptTCP()
-	if err != nil {
+	if c, err = ln.AcceptTCP(); err != nil {
+		return
+	} else if err = c.(*net.TCPConn).SetKeepAlive(true); err != nil {
+		return
+	} else if err = c.(*net.TCPConn).SetKeepAlivePeriod(3 * time.Minute); err != nil {
 		return
 	}
-	tc.SetKeepAlive(true)
-	tc.SetKeepAlivePeriod(3 * time.Minute)
-	return tc, nil
+	return
 }
 
 func newListener(address string) (*tcpKeepAliveListener, error) {
@@ -780,3 +834,10 @@ func newListener(address string) (*tcpKeepAliveListener, error) {
 	}
 	return &tcpKeepAliveListener{l.(*net.TCPListener)}, nil
 }
+
+func applyMiddleware(h HandlerFunc, middleware ...MiddlewareFunc) HandlerFunc {
+	for i := len(middleware) - 1; i >= 0; i-- {
+		h = middleware[i](h)
+	}
+	return h
+}
diff --git a/vendor/github.com/labstack/echo/v4/go.mod b/vendor/github.com/labstack/echo/v4/go.mod
index 2853cba5..d76b9843 100644
--- a/vendor/github.com/labstack/echo/v4/go.mod
+++ b/vendor/github.com/labstack/echo/v4/go.mod
@@ -1,13 +1,15 @@
 module github.com/labstack/echo/v4
 
+go 1.12
+
 require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
-	github.com/labstack/gommon v0.2.8
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.4 // indirect
+	github.com/labstack/gommon v0.2.9
 	github.com/stretchr/testify v1.3.0
-	github.com/valyala/bytebufferpool v1.0.0 // indirect
-	github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4
-	golang.org/x/crypto v0.0.0-20190130090550-b01c7a725664
-	golang.org/x/sys v0.0.0-20190129075346-302c3dd5f1cc // indirect
+	github.com/valyala/fasttemplate v1.0.1
+	golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5
+	golang.org/x/net v0.0.0-20190607181551-461777fb6f67 // indirect
+	golang.org/x/sys v0.0.0-20190609082536-301114b31cce // indirect
+	golang.org/x/text v0.3.2 // indirect
+	golang.org/x/tools v0.0.0-20190608022120-eacb66d2a7c3 // indirect
 )
diff --git a/vendor/github.com/labstack/echo/v4/go.sum b/vendor/github.com/labstack/echo/v4/go.sum
index e6981931..48c5b8f1 100644
--- a/vendor/github.com/labstack/echo/v4/go.sum
+++ b/vendor/github.com/labstack/echo/v4/go.sum
@@ -1,23 +1,53 @@
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/labstack/gommon v0.2.8 h1:JvRqmeZcfrHC5u6uVleB4NxxNbzx6gpbJiQknDbKQu0=
 github.com/labstack/gommon v0.2.8/go.mod h1:/tj9csK2iPSBvn+3NLM9e52usepMtrd5ilFYA+wQNJ4=
-github.com/mattn/go-colorable v0.0.9 h1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRUIY4=
-github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
-github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
-github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
+github.com/labstack/gommon v0.2.9 h1:heVeuAYtevIQVYkGj6A41dtfT91LrvFG220lavpWhrU=
+github.com/labstack/gommon v0.2.9/go.mod h1:E8ZTmW9vw5az5/ZyHWCp0Lw4OH2ecsaBP1C/NKavGG4=
+github.com/mattn/go-colorable v0.1.1 h1:G1f5SKeVxmagw/IyvzvtZE4Gybcc4Tr1tf7I8z0XgOg=
+github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcnceauSikq3lYCQ=
+github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
+github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.7 h1:UvyT9uN+3r7yLEYSlJsbQGdsaB/a0DlgWP3pql6iwOc=
+github.com/mattn/go-isatty v0.0.7/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.8 h1:HLtExJ+uU2HOZ+wI0Tt5DtUDrx8yhUqDcp7fYERX4CE=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
-github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4 h1:gKMu1Bf6QINDnvyZuTaACm9ofY+PRh+5vFz4oxBZeF8=
-github.com/valyala/fasttemplate v0.0.0-20170224212429-dcecefd839c4/go.mod h1:50wTf68f99/Zt14pr046Tgt3Lp2vLyFZKzbFXTOabXw=
-golang.org/x/crypto v0.0.0-20190130090550-b01c7a725664 h1:YbZJ76lQ1BqNhVe7dKTSB67wDrc2VPRR75IyGyyPDX8=
-golang.org/x/crypto v0.0.0-20190130090550-b01c7a725664/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20190129075346-302c3dd5f1cc h1:WiYx1rIFmx8c0mXAFtv5D/mHyKe1+jmuP7PViuwqwuQ=
-golang.org/x/sys v0.0.0-20190129075346-302c3dd5f1cc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+github.com/valyala/fasttemplate v1.0.1 h1:tY9CJiPnMXf1ERmG2EyK7gNUd+c6RKGD0IfU8WdUSz8=
+github.com/valyala/fasttemplate v1.0.1/go.mod h1:UQGH1tvbgY+Nz5t2n7tXsz52dQxojPUpymEIMZ47gx8=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734 h1:p/H982KKEjUnLJkM3tt/LemDnOc1GiZL5FCVlORJ5zo=
+golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5 h1:58fnuSXlxZmFdJyvtTFVmVhcMLU6v5fEb/ok4wyqtNU=
+golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190522155817-f3200d17e092 h1:4QSRKanuywn15aTZvI/mIDEgPQpswuFndXpOj3rKEco=
+golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.0.0-20190607181551-461777fb6f67 h1:rJJxsykSlULwd2P2+pg/rtnwN2FrWp4IuCxOSyS0V00=
+golang.org/x/net v0.0.0-20190607181551-461777fb6f67/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190531175056-4c3a928424d2 h1:T5DasATyLQfmbTpfEXx/IOL9vfjzW6up+ZDkmHvIf2s=
+golang.org/x/sys v0.0.0-20190531175056-4c3a928424d2/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190609082536-301114b31cce/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190608022120-eacb66d2a7c3/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
diff --git a/vendor/github.com/labstack/echo/v4/group.go b/vendor/github.com/labstack/echo/v4/group.go
index 3e3732b6..5d958253 100644
--- a/vendor/github.com/labstack/echo/v4/group.go
+++ b/vendor/github.com/labstack/echo/v4/group.go
@@ -2,7 +2,6 @@ package echo
 
 import (
 	"net/http"
-	"path"
 )
 
 type (
@@ -10,6 +9,8 @@ type (
 	// routes that share a common middleware or functionality that should be separate
 	// from the parent echo instance while still inheriting from it.
 	Group struct {
+		common
+		host       string
 		prefix     string
 		middleware []MiddlewareFunc
 		echo       *Echo
@@ -19,13 +20,13 @@ type (
 // Use implements `Echo#Use()` for sub-routes within the Group.
 func (g *Group) Use(middleware ...MiddlewareFunc) {
 	g.middleware = append(g.middleware, middleware...)
+	if len(g.middleware) == 0 {
+		return
+	}
 	// Allow all requests to reach the group as they might get dropped if router
 	// doesn't find a match, making none of the group middleware process.
-	for _, p := range []string{"", "/*"} {
-		g.echo.Any(path.Clean(g.prefix+p), func(c Context) error {
-			return NotFoundHandler(c)
-		}, g.middleware...)
-	}
+	g.Any("", NotFoundHandler)
+	g.Any("/*", NotFoundHandler)
 }
 
 // CONNECT implements `Echo#CONNECT()` for sub-routes within the Group.
@@ -92,21 +93,23 @@ func (g *Group) Match(methods []string, path string, handler HandlerFunc, middle
 }
 
 // Group creates a new sub-group with prefix and optional sub-group-level middleware.
-func (g *Group) Group(prefix string, middleware ...MiddlewareFunc) *Group {
+func (g *Group) Group(prefix string, middleware ...MiddlewareFunc) (sg *Group) {
 	m := make([]MiddlewareFunc, 0, len(g.middleware)+len(middleware))
 	m = append(m, g.middleware...)
 	m = append(m, middleware...)
-	return g.echo.Group(g.prefix+prefix, m...)
+	sg = g.echo.Group(g.prefix+prefix, m...)
+	sg.host = g.host
+	return
 }
 
 // Static implements `Echo#Static()` for sub-routes within the Group.
 func (g *Group) Static(prefix, root string) {
-	static(g, prefix, root)
+	g.static(prefix, root, g.GET)
 }
 
 // File implements `Echo#File()` for sub-routes within the Group.
 func (g *Group) File(path, file string) {
-	g.echo.File(g.prefix+path, file)
+	g.file(g.prefix+path, file, g.GET)
 }
 
 // Add implements `Echo#Add()` for sub-routes within the Group.
@@ -117,5 +120,5 @@ func (g *Group) Add(method, path string, handler HandlerFunc, middleware ...Midd
 	m := make([]MiddlewareFunc, 0, len(g.middleware)+len(middleware))
 	m = append(m, g.middleware...)
 	m = append(m, middleware...)
-	return g.echo.Add(method, g.prefix+path, handler, m...)
+	return g.echo.add(g.host, method, g.prefix+path, handler, m...)
 }
diff --git a/vendor/github.com/labstack/echo/v4/middleware/compress.go b/vendor/github.com/labstack/echo/v4/middleware/compress.go
index 19052064..89da16ef 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/compress.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/compress.go
@@ -111,6 +111,9 @@ func (w *gzipResponseWriter) Write(b []byte) (int, error) {
 
 func (w *gzipResponseWriter) Flush() {
 	w.Writer.(*gzip.Writer).Flush()
+	if flusher, ok := w.ResponseWriter.(http.Flusher); ok {
+		flusher.Flush()
+	}
 }
 
 func (w *gzipResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
diff --git a/vendor/github.com/labstack/echo/v4/middleware/cors.go b/vendor/github.com/labstack/echo/v4/middleware/cors.go
index c61c7125..5dfe31f9 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/cors.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/cors.go
@@ -102,6 +102,10 @@ func CORSWithConfig(config CORSConfig) echo.MiddlewareFunc {
 					allowOrigin = o
 					break
 				}
+				if matchSubdomain(origin, o) {
+					allowOrigin = origin
+					break
+				}
 			}
 
 			// Simple request
diff --git a/vendor/github.com/labstack/echo/v4/middleware/jwt.go b/vendor/github.com/labstack/echo/v4/middleware/jwt.go
index 861d3142..d4420246 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/jwt.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/jwt.go
@@ -26,10 +26,14 @@ type (
 		// It may be used to define a custom JWT error.
 		ErrorHandler JWTErrorHandler
 
-		// Signing key to validate token.
-		// Required.
+		// Signing key to validate token. Used as fallback if SigningKeys has length 0.
+		// Required. This or SigningKeys.
 		SigningKey interface{}
 
+		// Map of signing keys to validate token with kid field usage.
+		// Required. This or SigningKey.
+		SigningKeys map[string]interface{}
+
 		// Signing method, used to check token signing method.
 		// Optional. Default value HS256.
 		SigningMethod string
@@ -48,6 +52,7 @@ type (
 		// Possible values:
 		// - "header:<name>"
 		// - "query:<name>"
+		// - "param:<name>"
 		// - "cookie:<name>"
 		TokenLookup string
 
@@ -110,7 +115,7 @@ func JWTWithConfig(config JWTConfig) echo.MiddlewareFunc {
 	if config.Skipper == nil {
 		config.Skipper = DefaultJWTConfig.Skipper
 	}
-	if config.SigningKey == nil {
+	if config.SigningKey == nil && len(config.SigningKeys) == 0 {
 		panic("echo: jwt middleware requires signing key")
 	}
 	if config.SigningMethod == "" {
@@ -133,6 +138,15 @@ func JWTWithConfig(config JWTConfig) echo.MiddlewareFunc {
 		if t.Method.Alg() != config.SigningMethod {
 			return nil, fmt.Errorf("unexpected jwt signing method=%v", t.Header["alg"])
 		}
+		if len(config.SigningKeys) > 0 {
+			if kid, ok := t.Header["kid"].(string); ok {
+				if key, ok := config.SigningKeys[kid]; ok {
+					return key, nil
+				}
+			}
+			return nil, fmt.Errorf("unexpected jwt key id=%v", t.Header["kid"])
+		}
+
 		return config.SigningKey, nil
 	}
 
@@ -142,6 +156,8 @@ func JWTWithConfig(config JWTConfig) echo.MiddlewareFunc {
 	switch parts[0] {
 	case "query":
 		extractor = jwtFromQuery(parts[1])
+	case "param":
+		extractor = jwtFromParam(parts[1])
 	case "cookie":
 		extractor = jwtFromCookie(parts[1])
 	}
@@ -215,6 +231,17 @@ func jwtFromQuery(param string) jwtExtractor {
 	}
 }
 
+// jwtFromParam returns a `jwtExtractor` that extracts token from the url param string.
+func jwtFromParam(param string) jwtExtractor {
+	return func(c echo.Context) (string, error) {
+		token := c.Param(param)
+		if token == "" {
+			return "", ErrJWTMissing
+		}
+		return token, nil
+	}
+}
+
 // jwtFromCookie returns a `jwtExtractor` that extracts token from the named cookie.
 func jwtFromCookie(name string) jwtExtractor {
 	return func(c echo.Context) (string, error) {
diff --git a/vendor/github.com/labstack/echo/v4/middleware/key_auth.go b/vendor/github.com/labstack/echo/v4/middleware/key_auth.go
index fe01e23e..94cfd142 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/key_auth.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/key_auth.go
@@ -99,11 +99,14 @@ func KeyAuthWithConfig(config KeyAuthConfig) echo.MiddlewareFunc {
 			}
 			valid, err := config.Validator(key, c)
 			if err != nil {
-				return err
+				return &echo.HTTPError{
+					Code:     http.StatusUnauthorized,
+					Message:  "invalid key",
+					Internal: err,
+				}
 			} else if valid {
 				return next(c)
 			}
-
 			return echo.ErrUnauthorized
 		}
 	}
diff --git a/vendor/github.com/labstack/echo/v4/middleware/logger.go b/vendor/github.com/labstack/echo/v4/middleware/logger.go
index b2e48347..6fd59efb 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/logger.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/logger.go
@@ -2,6 +2,7 @@ package middleware
 
 import (
 	"bytes"
+	"encoding/json"
 	"io"
 	"os"
 	"strconv"
@@ -20,7 +21,7 @@ type (
 		// Skipper defines a function to skip middleware.
 		Skipper Skipper
 
-		// Tags to constructed the logger format.
+		// Tags to construct the logger format.
 		//
 		// - time_unix
 		// - time_unix_nano
@@ -175,7 +176,10 @@ func LoggerWithConfig(config LoggerConfig) echo.MiddlewareFunc {
 					return buf.WriteString(s)
 				case "error":
 					if err != nil {
-						return buf.WriteString(err.Error())
+						// Error may contain invalid JSON e.g. `"`
+						b, _ := json.Marshal(err.Error())
+						b = b[1 : len(b)-1]
+						return buf.Write(b)
 					}
 				case "latency":
 					l := stop.Sub(start)
diff --git a/vendor/github.com/labstack/echo/v4/middleware/proxy.go b/vendor/github.com/labstack/echo/v4/middleware/proxy.go
index 9d67f445..532346d5 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/proxy.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/proxy.go
@@ -200,7 +200,7 @@ func Proxy(balancer ProxyBalancer) echo.MiddlewareFunc {
 func ProxyWithConfig(config ProxyConfig) echo.MiddlewareFunc {
 	// Defaults
 	if config.Skipper == nil {
-		config.Skipper = DefaultLoggerConfig.Skipper
+		config.Skipper = DefaultProxyConfig.Skipper
 	}
 	if config.Balancer == nil {
 		panic("echo: proxy middleware requires balancer")
diff --git a/vendor/github.com/labstack/echo/v4/middleware/redirect.go b/vendor/github.com/labstack/echo/v4/middleware/redirect.go
index 30a2e403..813e5b85 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/redirect.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/redirect.go
@@ -21,7 +21,7 @@ type RedirectConfig struct {
 // 2) return the appropriate redirect url.
 type redirectLogic func(scheme, host, uri string) (ok bool, url string)
 
-const www = "www"
+const www = "www."
 
 // DefaultRedirectConfig is the default Redirect middleware config.
 var DefaultRedirectConfig = RedirectConfig{
@@ -60,7 +60,7 @@ func HTTPSWWWRedirect() echo.MiddlewareFunc {
 // See `HTTPSWWWRedirect()`.
 func HTTPSWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
 	return redirect(config, func(scheme, host, uri string) (ok bool, url string) {
-		if ok = scheme != "https" && host[:3] != www; ok {
+		if ok = scheme != "https" && host[:4] != www; ok {
 			url = "https://www." + host + uri
 		}
 		return
@@ -80,7 +80,7 @@ func HTTPSNonWWWRedirect() echo.MiddlewareFunc {
 func HTTPSNonWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
 	return redirect(config, func(scheme, host, uri string) (ok bool, url string) {
 		if ok = scheme != "https"; ok {
-			if host[:3] == www {
+			if host[:4] == www {
 				host = host[4:]
 			}
 			url = "https://" + host + uri
@@ -101,7 +101,7 @@ func WWWRedirect() echo.MiddlewareFunc {
 // See `WWWRedirect()`.
 func WWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
 	return redirect(config, func(scheme, host, uri string) (ok bool, url string) {
-		if ok = host[:3] != www; ok {
+		if ok = host[:4] != www; ok {
 			url = scheme + "://www." + host + uri
 		}
 		return
@@ -120,7 +120,7 @@ func NonWWWRedirect() echo.MiddlewareFunc {
 // See `NonWWWRedirect()`.
 func NonWWWRedirectWithConfig(config RedirectConfig) echo.MiddlewareFunc {
 	return redirect(config, func(scheme, host, uri string) (ok bool, url string) {
-		if ok = host[:3] == www; ok {
+		if ok = host[:4] == www; ok {
 			url = scheme + "://" + host[4:] + uri
 		}
 		return
diff --git a/vendor/github.com/labstack/echo/v4/middleware/secure.go b/vendor/github.com/labstack/echo/v4/middleware/secure.go
index 8839c879..77a1487f 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/secure.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/secure.go
@@ -53,6 +53,19 @@ type (
 		// trusted web page context.
 		// Optional. Default value "".
 		ContentSecurityPolicy string `yaml:"content_security_policy"`
+
+		// CSPReportOnly would use the `Content-Security-Policy-Report-Only` header instead
+		// of the `Content-Security-Policy` header. This allows iterative updates of the
+		// content security policy by only reporting the violations that would
+		// have occurred instead of blocking the resource.
+		// Optional. Default value false.
+		CSPReportOnly bool `yaml:"csp_report_only"`
+
+		// HSTSPreloadEnabled will add the preload tag in the `Strict Transport Security`
+		// header, which enables the domain to be included in the HSTS preload list
+		// maintained by Chrome (and used by Firefox and Safari): https://hstspreload.org/
+		// Optional.  Default value false.
+		HSTSPreloadEnabled bool `yaml:"hsts_preload_enabled"`
 	}
 )
 
@@ -63,6 +76,7 @@ var (
 		XSSProtection:      "1; mode=block",
 		ContentTypeNosniff: "nosniff",
 		XFrameOptions:      "SAMEORIGIN",
+		HSTSPreloadEnabled: false,
 	}
 )
 
@@ -105,10 +119,17 @@ func SecureWithConfig(config SecureConfig) echo.MiddlewareFunc {
 				if !config.HSTSExcludeSubdomains {
 					subdomains = "; includeSubdomains"
 				}
+				if config.HSTSPreloadEnabled {
+					subdomains = fmt.Sprintf("%s; preload", subdomains)
+				}
 				res.Header().Set(echo.HeaderStrictTransportSecurity, fmt.Sprintf("max-age=%d%s", config.HSTSMaxAge, subdomains))
 			}
 			if config.ContentSecurityPolicy != "" {
-				res.Header().Set(echo.HeaderContentSecurityPolicy, config.ContentSecurityPolicy)
+				if config.CSPReportOnly {
+					res.Header().Set(echo.HeaderContentSecurityPolicyReportOnly, config.ContentSecurityPolicy)
+				} else {
+					res.Header().Set(echo.HeaderContentSecurityPolicy, config.ContentSecurityPolicy)
+				}
 			}
 			return next(c)
 		}
diff --git a/vendor/github.com/labstack/echo/v4/middleware/slash.go b/vendor/github.com/labstack/echo/v4/middleware/slash.go
index 61d6e30b..0492b334 100644
--- a/vendor/github.com/labstack/echo/v4/middleware/slash.go
+++ b/vendor/github.com/labstack/echo/v4/middleware/slash.go
@@ -1,6 +1,8 @@
 package middleware
 
 import (
+	"strings"
+
 	"github.com/labstack/echo/v4"
 )
 
@@ -49,7 +51,7 @@ func AddTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc
 			url := req.URL
 			path := url.Path
 			qs := c.QueryString()
-			if path != "/" && path[len(path)-1] != '/' {
+			if !strings.HasSuffix(path, "/") {
 				path += "/"
 				uri := path
 				if qs != "" {
@@ -97,7 +99,7 @@ func RemoveTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFu
 			path := url.Path
 			qs := c.QueryString()
 			l := len(path) - 1
-			if l >= 0 && path != "/" && path[l] == '/' {
+			if l > 0 && strings.HasSuffix(path, "/") {
 				path = path[:l]
 				uri := path
 				if qs != "" {
diff --git a/vendor/github.com/labstack/echo/v4/middleware/util.go b/vendor/github.com/labstack/echo/v4/middleware/util.go
new file mode 100644
index 00000000..ab951a0e
--- /dev/null
+++ b/vendor/github.com/labstack/echo/v4/middleware/util.go
@@ -0,0 +1,54 @@
+package middleware
+
+import (
+	"strings"
+)
+
+func matchScheme(domain, pattern string) bool {
+	didx := strings.Index(domain, ":")
+	pidx := strings.Index(pattern, ":")
+	return didx != -1 && pidx != -1 && domain[:didx] == pattern[:pidx]
+}
+
+// matchSubdomain compares authority with wildcard
+func matchSubdomain(domain, pattern string) bool {
+	if !matchScheme(domain, pattern) {
+		return false
+	}
+	didx := strings.Index(domain, "://")
+	pidx := strings.Index(pattern, "://")
+	if didx == -1 || pidx == -1 {
+		return false
+	}
+	domAuth := domain[didx+3:]
+	// to avoid long loop by invalid long domain
+	if len(domAuth) > 253 {
+		return false
+	}
+	patAuth := pattern[pidx+3:]
+
+	domComp := strings.Split(domAuth, ".")
+	patComp := strings.Split(patAuth, ".")
+	for i := len(domComp)/2 - 1; i >= 0; i-- {
+		opp := len(domComp) - 1 - i
+		domComp[i], domComp[opp] = domComp[opp], domComp[i]
+	}
+	for i := len(patComp)/2 - 1; i >= 0; i-- {
+		opp := len(patComp) - 1 - i
+		patComp[i], patComp[opp] = patComp[opp], patComp[i]
+	}
+
+	for i, v := range domComp {
+		if len(patComp) <= i {
+			return false
+		}
+		p := patComp[i]
+		if p == "*" {
+			return true
+		}
+		if p != v {
+			return false
+		}
+	}
+	return false
+}
diff --git a/vendor/github.com/labstack/echo/v4/response.go b/vendor/github.com/labstack/echo/v4/response.go
index eb2d988d..ca7405c5 100644
--- a/vendor/github.com/labstack/echo/v4/response.go
+++ b/vendor/github.com/labstack/echo/v4/response.go
@@ -67,7 +67,10 @@ func (r *Response) WriteHeader(code int) {
 // Write writes the data to the connection as part of an HTTP reply.
 func (r *Response) Write(b []byte) (n int, err error) {
 	if !r.Committed {
-		r.WriteHeader(http.StatusOK)
+		if r.Status == 0 {
+			r.Status = http.StatusOK
+		}
+		r.WriteHeader(r.Status)
 	}
 	n, err = r.Writer.Write(b)
 	r.Size += int64(n)
diff --git a/vendor/github.com/labstack/echo/v4/router.go b/vendor/github.com/labstack/echo/v4/router.go
index 73f0b68b..8d3a0180 100644
--- a/vendor/github.com/labstack/echo/v4/router.go
+++ b/vendor/github.com/labstack/echo/v4/router.go
@@ -33,6 +33,7 @@ type (
 		propfind HandlerFunc
 		put      HandlerFunc
 		trace    HandlerFunc
+		report   HandlerFunc
 	}
 )
 
@@ -57,7 +58,7 @@ func NewRouter(e *Echo) *Router {
 func (r *Router) Add(method, path string, h HandlerFunc) {
 	// Validate path
 	if path == "" {
-		panic("echo: path cannot be empty")
+		path = "/"
 	}
 	if path[0] != '/' {
 		path = "/" + path
@@ -79,14 +80,13 @@ func (r *Router) Add(method, path string, h HandlerFunc) {
 
 			if i == l {
 				r.insert(method, path[:i], h, pkind, ppath, pnames)
-				return
+			} else {
+				r.insert(method, path[:i], nil, pkind, "", nil)
 			}
-			r.insert(method, path[:i], nil, pkind, "", nil)
 		} else if path[i] == '*' {
 			r.insert(method, path[:i], nil, skind, "", nil)
 			pnames = append(pnames, "*")
 			r.insert(method, path[:i+1], h, akind, ppath, pnames)
-			return
 		}
 	}
 
@@ -248,6 +248,8 @@ func (n *node) addHandler(method string, h HandlerFunc) {
 		n.methodHandler.put = h
 	case http.MethodTrace:
 		n.methodHandler.trace = h
+	case REPORT:
+		n.methodHandler.report = h
 	}
 }
 
@@ -273,6 +275,8 @@ func (n *node) findHandler(method string) HandlerFunc {
 		return n.methodHandler.put
 	case http.MethodTrace:
 		return n.methodHandler.trace
+	case REPORT:
+		return n.methodHandler.report
 	default:
 		return nil
 	}
diff --git a/vendor/github.com/labstack/gommon/bytes/bytes.go b/vendor/github.com/labstack/gommon/bytes/bytes.go
index 746436cb..232c8d25 100644
--- a/vendor/github.com/labstack/gommon/bytes/bytes.go
+++ b/vendor/github.com/labstack/gommon/bytes/bytes.go
@@ -22,7 +22,7 @@ const (
 )
 
 var (
-	pattern = regexp.MustCompile(`(?i)^(-?\d+(?:\.\d+)?)([KMGTPE]B?|B?)$`)
+	pattern = regexp.MustCompile(`(?i)^(-?\d+(?:\.\d+)?)\s?([KMGTPE]B?|B?)$`)
 	global  = New()
 )
 
diff --git a/vendor/github.com/labstack/gommon/log/log.go b/vendor/github.com/labstack/gommon/log/log.go
index 132411db..06fa37e0 100644
--- a/vendor/github.com/labstack/gommon/log/log.go
+++ b/vendor/github.com/labstack/gommon/log/log.go
@@ -10,6 +10,7 @@ import (
 	"runtime"
 	"strconv"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/mattn/go-isatty"
@@ -21,7 +22,7 @@ import (
 type (
 	Logger struct {
 		prefix     string
-		level      Lvl
+		level      uint32
 		skip       int
 		output     io.Writer
 		template   *fasttemplate.Template
@@ -58,7 +59,7 @@ func init() {
 
 func New(prefix string) (l *Logger) {
 	l = &Logger{
-		level:    INFO,
+		level:    uint32(INFO),
 		skip:     2,
 		prefix:   prefix,
 		template: l.newTemplate(defaultHeader),
@@ -110,11 +111,11 @@ func (l *Logger) SetPrefix(p string) {
 }
 
 func (l *Logger) Level() Lvl {
-	return l.level
+	return Lvl(atomic.LoadUint32(&l.level))
 }
 
-func (l *Logger) SetLevel(v Lvl) {
-	l.level = v
+func (l *Logger) SetLevel(level Lvl) {
+	atomic.StoreUint32(&l.level, uint32(level))
 }
 
 func (l *Logger) Output() io.Writer {
@@ -247,8 +248,8 @@ func Level() Lvl {
 	return global.Level()
 }
 
-func SetLevel(v Lvl) {
-	global.SetLevel(v)
+func SetLevel(level Lvl) {
+	global.SetLevel(level)
 }
 
 func Output() io.Writer {
@@ -347,16 +348,14 @@ func Panicj(j JSON) {
 	global.Panicj(j)
 }
 
-func (l *Logger) log(v Lvl, format string, args ...interface{}) {
-	l.mutex.Lock()
-	defer l.mutex.Unlock()
-	buf := l.bufferPool.Get().(*bytes.Buffer)
-	buf.Reset()
-	defer l.bufferPool.Put(buf)
-	_, file, line, _ := runtime.Caller(l.skip)
-
-	if v >= l.level || v == 0 {
+func (l *Logger) log(level Lvl, format string, args ...interface{}) {
+	if level >= l.Level() || level == 0 {
+		buf := l.bufferPool.Get().(*bytes.Buffer)
+		buf.Reset()
+		defer l.bufferPool.Put(buf)
+		_, file, line, _ := runtime.Caller(l.skip)
 		message := ""
+
 		if format == "" {
 			message = fmt.Sprint(args...)
 		} else if format == "json" {
@@ -376,7 +375,7 @@ func (l *Logger) log(v Lvl, format string, args ...interface{}) {
 			case "time_rfc3339_nano":
 				return w.Write([]byte(time.Now().Format(time.RFC3339Nano)))
 			case "level":
-				return w.Write([]byte(l.levels[v]))
+				return w.Write([]byte(l.levels[level]))
 			case "prefix":
 				return w.Write([]byte(l.prefix))
 			case "long_file":
@@ -409,6 +408,8 @@ func (l *Logger) log(v Lvl, format string, args ...interface{}) {
 				buf.WriteString(message)
 			}
 			buf.WriteByte('\n')
+			l.mutex.Lock()
+			defer l.mutex.Unlock()
 			l.output.Write(buf.Bytes())
 		}
 	}
diff --git a/vendor/github.com/mattn/go-colorable/go.mod b/vendor/github.com/mattn/go-colorable/go.mod
index 9d9f4248..ef3ca9d4 100644
--- a/vendor/github.com/mattn/go-colorable/go.mod
+++ b/vendor/github.com/mattn/go-colorable/go.mod
@@ -1,3 +1,3 @@
 module github.com/mattn/go-colorable
 
-require github.com/mattn/go-isatty v0.0.5
+require github.com/mattn/go-isatty v0.0.8
diff --git a/vendor/github.com/mattn/go-isatty/isatty_android.go b/vendor/github.com/mattn/go-isatty/isatty_android.go
new file mode 100644
index 00000000..d3567cb5
--- /dev/null
+++ b/vendor/github.com/mattn/go-isatty/isatty_android.go
@@ -0,0 +1,23 @@
+// +build android
+
+package isatty
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const ioctlReadTermios = syscall.TCGETS
+
+// IsTerminal return true if the file descriptor is terminal.
+func IsTerminal(fd uintptr) bool {
+	var termios syscall.Termios
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return err == 0
+}
+
+// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
+// terminal. This is also always false on this environment.
+func IsCygwinTerminal(fd uintptr) bool {
+	return false
+}
diff --git a/vendor/github.com/mattn/go-isatty/isatty_others.go b/vendor/github.com/mattn/go-isatty/isatty_others.go
index f02849c5..ff714a37 100644
--- a/vendor/github.com/mattn/go-isatty/isatty_others.go
+++ b/vendor/github.com/mattn/go-isatty/isatty_others.go
@@ -1,4 +1,4 @@
-// +build appengine js
+// +build appengine js nacl
 
 package isatty
 
diff --git a/vendor/github.com/mattn/go-isatty/isatty_linux.go b/vendor/github.com/mattn/go-isatty/isatty_tcgets.go
index e004038e..453b025d 100644
--- a/vendor/github.com/mattn/go-isatty/isatty_linux.go
+++ b/vendor/github.com/mattn/go-isatty/isatty_tcgets.go
@@ -1,5 +1,6 @@
-// +build linux
+// +build linux aix
 // +build !appengine
+// +build !android
 
 package isatty
 
diff --git a/vendor/github.com/paulrosania/go-charset/charset/ascii.go b/vendor/github.com/paulrosania/go-charset/charset/ascii.go
index ccf3a35b..0e73d066 100644
--- a/vendor/github.com/paulrosania/go-charset/charset/ascii.go
+++ b/vendor/github.com/paulrosania/go-charset/charset/ascii.go
@@ -21,7 +21,7 @@ type codePointError struct {
 }
 
 func (e *codePointError) Error() string {
-	return fmt.Sprintf("Parse error at index %n: Code point %n is undefined in %s", e.i, e.cp, e.charset)
+	return fmt.Sprintf("Parse error at index %d: Code point %d is undefined in %s", e.i, e.cp, e.charset)
 }
 
 func (strict translateFromASCII) Translate(data []byte, eof bool) (int, []byte, error) {
diff --git a/vendor/github.com/paulrosania/go-charset/charset/charset.go b/vendor/github.com/paulrosania/go-charset/charset/charset.go
index 6ab6cf89..ea441adf 100644
--- a/vendor/github.com/paulrosania/go-charset/charset/charset.go
+++ b/vendor/github.com/paulrosania/go-charset/charset/charset.go
@@ -6,7 +6,7 @@
 //
 //	import _ "github.com/paulrosania/go-charset/data"
 //
-// It can also made available in a data directory (by settting CharsetDir).
+// It can also made available in a data directory (by setting CharsetDir).
 package charset
 
 import (
diff --git a/vendor/github.com/sirupsen/logrus/.travis.yml b/vendor/github.com/sirupsen/logrus/.travis.yml
index a8f15451..848938a6 100644
--- a/vendor/github.com/sirupsen/logrus/.travis.yml
+++ b/vendor/github.com/sirupsen/logrus/.travis.yml
@@ -1,52 +1,25 @@
 language: go
 go_import_path: github.com/sirupsen/logrus
+git:
+  depth: 1
 env:
-  - GOMAXPROCS=4 GORACE=halt_on_error=1
+  - GO111MODULE=on
+  - GO111MODULE=off
+go: [ 1.11.x, 1.12.x ]
+os: [ linux, osx ]
 matrix:
-  include:
-    - go: 1.10.x
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/crypto/ssh/terminal
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v ./...
-    - go: 1.11.x
-      env: GO111MODULE=on
-      install:
-        - go mod download
-      script:
-        - go test -race -v ./...
-    - go: 1.11.x
+  exclude:
+    - go: 1.12.x
       env: GO111MODULE=off
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/crypto/ssh/terminal
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v ./...
-    - go: 1.10.x
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/crypto/ssh/terminal
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v -tags appengine ./...
     - go: 1.11.x
-      env: GO111MODULE=on
-      install:
-        - go mod download
-      script:
-        - go test -race -v -tags appengine ./...
-    - go: 1.11.x
-      env: GO111MODULE=off
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/crypto/ssh/terminal
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v -tags appengine ./...
+      os: osx
+install:
+  - ./travis/install.sh
+  - if [[ "$GO111MODULE" ==  "on" ]]; then go mod download; fi
+  - if [[ "$GO111MODULE" == "off" ]]; then go get github.com/stretchr/testify/assert golang.org/x/sys/unix github.com/konsorten/go-windows-terminal-sequences; fi
+script:
+  - ./travis/cross_build.sh
+  - export GOMAXPROCS=4
+  - export GORACE=halt_on_error=1
+  - go test -race -v ./...
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then go test -race -v -tags appengine ./... ; fi
diff --git a/vendor/github.com/sirupsen/logrus/CHANGELOG.md b/vendor/github.com/sirupsen/logrus/CHANGELOG.md
index cb85d9f9..51a7ab0c 100644
--- a/vendor/github.com/sirupsen/logrus/CHANGELOG.md
+++ b/vendor/github.com/sirupsen/logrus/CHANGELOG.md
@@ -1,3 +1,38 @@
+# 1.4.2
+  * Fixes build break for plan9, nacl, solaris
+# 1.4.1
+This new release introduces:
+  * Enhance TextFormatter to not print caller information when they are empty (#944)
+  * Remove dependency on golang.org/x/crypto (#932, #943) 
+
+Fixes:
+  * Fix Entry.WithContext method to return a copy of the initial entry (#941)
+
+# 1.4.0
+This new release introduces:
+  * Add `DeferExitHandler`, similar to `RegisterExitHandler` but prepending the handler to the list of handlers (semantically like `defer`) (#848).
+  * Add `CallerPrettyfier` to `JSONFormatter` and `TextFormatter (#909, #911)
+  * Add `Entry.WithContext()` and `Entry.Context`, to set a context on entries to be used e.g. in hooks (#919).
+
+Fixes:
+  * Fix wrong method calls `Logger.Print` and `Logger.Warningln` (#893).
+  * Update `Entry.Logf` to not do string formatting unless the log level is enabled (#903)
+  * Fix infinite recursion on unknown `Level.String()` (#907)
+  * Fix race condition in `getCaller` (#916).
+
+
+# 1.3.0
+This new release introduces:
+  * Log, Logf, Logln functions for Logger and Entry that take a Level
+
+Fixes:
+  * Building prometheus node_exporter on AIX (#840)
+  * Race condition in TextFormatter (#468)
+  * Travis CI import path (#868)
+  * Remove coloured output on Windows (#862)
+  * Pointer to func as field in JSONFormatter (#870)
+  * Properly marshal Levels (#873)
+
 # 1.2.0
 This new release introduces:
   * A new method `SetReportCaller` in the `Logger` to enable the file, line and calling function from which the trace has been issued
diff --git a/vendor/github.com/sirupsen/logrus/README.md b/vendor/github.com/sirupsen/logrus/README.md
index 39873105..a4796eb0 100644
--- a/vendor/github.com/sirupsen/logrus/README.md
+++ b/vendor/github.com/sirupsen/logrus/README.md
@@ -365,6 +365,7 @@ Third party logging formatters:
 * [`logstash`](https://github.com/bshuster-repo/logrus-logstash-hook). Logs fields as [Logstash](http://logstash.net) Events.
 * [`prefixed`](https://github.com/x-cray/logrus-prefixed-formatter). Displays log entry source along with alternative layout.
 * [`zalgo`](https://github.com/aybabtme/logzalgo). Invoking the P͉̫o̳̼̊w̖͈̰͎e̬͔̭͂r͚̼̹̲ ̫͓͉̳͈ō̠͕͖̚f̝͍̠ ͕̲̞͖͑Z̖̫̤̫ͪa͉̬͈̗l͖͎g̳̥o̰̥̅!̣͔̲̻͊̄ ̙̘̦̹̦.
+* [`nested-logrus-formatter`](https://github.com/antonfisher/nested-logrus-formatter). Converts logrus fields to a nested structure.
 
 You can define your formatter by implementing the `Formatter` interface,
 requiring a `Format` method. `Format` takes an `*Entry`. `entry.Data` is a
diff --git a/vendor/github.com/sirupsen/logrus/alt_exit.go b/vendor/github.com/sirupsen/logrus/alt_exit.go
index 8af90637..8fd189e1 100644
--- a/vendor/github.com/sirupsen/logrus/alt_exit.go
+++ b/vendor/github.com/sirupsen/logrus/alt_exit.go
@@ -51,9 +51,9 @@ func Exit(code int) {
 	os.Exit(code)
 }
 
-// RegisterExitHandler adds a Logrus Exit handler, call logrus.Exit to invoke
-// all handlers. The handlers will also be invoked when any Fatal log entry is
-// made.
+// RegisterExitHandler appends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
 //
 // This method is useful when a caller wishes to use logrus to log a fatal
 // message but also needs to gracefully shutdown. An example usecase could be
@@ -62,3 +62,15 @@ func Exit(code int) {
 func RegisterExitHandler(handler func()) {
 	handlers = append(handlers, handler)
 }
+
+// DeferExitHandler prepends a Logrus Exit handler to the list of handlers,
+// call logrus.Exit to invoke all handlers. The handlers will also be invoked when
+// any Fatal log entry is made.
+//
+// This method is useful when a caller wishes to use logrus to log a fatal
+// message but also needs to gracefully shutdown. An example usecase could be
+// closing database connections, or sending a alert that the application is
+// closing.
+func DeferExitHandler(handler func()) {
+	handlers = append([]func(){handler}, handlers...)
+}
diff --git a/vendor/github.com/sirupsen/logrus/entry.go b/vendor/github.com/sirupsen/logrus/entry.go
index df6d188d..63e25583 100644
--- a/vendor/github.com/sirupsen/logrus/entry.go
+++ b/vendor/github.com/sirupsen/logrus/entry.go
@@ -2,6 +2,7 @@ package logrus
 
 import (
 	"bytes"
+	"context"
 	"fmt"
 	"os"
 	"reflect"
@@ -69,6 +70,9 @@ type Entry struct {
 	// When formatter is called in entry.log(), a Buffer may be set to entry
 	Buffer *bytes.Buffer
 
+	// Contains the context set by the user. Useful for hook processing etc.
+	Context context.Context
+
 	// err may contain a field formatting error
 	err string
 }
@@ -97,6 +101,11 @@ func (entry *Entry) WithError(err error) *Entry {
 	return entry.WithField(ErrorKey, err)
 }
 
+// Add a context to the Entry.
+func (entry *Entry) WithContext(ctx context.Context) *Entry {
+	return &Entry{Logger: entry.Logger, Data: entry.Data, Time: entry.Time, err: entry.err, Context: ctx}
+}
+
 // Add a single field to the Entry.
 func (entry *Entry) WithField(key string, value interface{}) *Entry {
 	return entry.WithFields(Fields{key: value})
@@ -130,12 +139,12 @@ func (entry *Entry) WithFields(fields Fields) *Entry {
 			data[k] = v
 		}
 	}
-	return &Entry{Logger: entry.Logger, Data: data, Time: entry.Time, err: fieldErr}
+	return &Entry{Logger: entry.Logger, Data: data, Time: entry.Time, err: fieldErr, Context: entry.Context}
 }
 
 // Overrides the time of the Entry.
 func (entry *Entry) WithTime(t time.Time) *Entry {
-	return &Entry{Logger: entry.Logger, Data: entry.Data, Time: t, err: entry.err}
+	return &Entry{Logger: entry.Logger, Data: entry.Data, Time: t, err: entry.err, Context: entry.Context}
 }
 
 // getPackageName reduces a fully qualified function name to the package name
@@ -156,20 +165,23 @@ func getPackageName(f string) string {
 
 // getCaller retrieves the name of the first non-logrus calling function
 func getCaller() *runtime.Frame {
-	// Restrict the lookback frames to avoid runaway lookups
-	pcs := make([]uintptr, maximumCallerDepth)
-	depth := runtime.Callers(minimumCallerDepth, pcs)
-	frames := runtime.CallersFrames(pcs[:depth])
 
 	// cache this package's fully-qualified name
 	callerInitOnce.Do(func() {
-		logrusPackage = getPackageName(runtime.FuncForPC(pcs[0]).Name())
+		pcs := make([]uintptr, 2)
+		_ = runtime.Callers(0, pcs)
+		logrusPackage = getPackageName(runtime.FuncForPC(pcs[1]).Name())
 
 		// now that we have the cache, we can skip a minimum count of known-logrus functions
-		// XXX this is dubious, the number of frames may vary store an entry in a logger interface
+		// XXX this is dubious, the number of frames may vary
 		minimumCallerDepth = knownLogrusFrames
 	})
 
+	// Restrict the lookback frames to avoid runaway lookups
+	pcs := make([]uintptr, maximumCallerDepth)
+	depth := runtime.Callers(minimumCallerDepth, pcs)
+	frames := runtime.CallersFrames(pcs[:depth])
+
 	for f, again := frames.Next(); again; f, again = frames.Next() {
 		pkg := getPackageName(f.Function)
 
@@ -298,7 +310,9 @@ func (entry *Entry) Panic(args ...interface{}) {
 // Entry Printf family functions
 
 func (entry *Entry) Logf(level Level, format string, args ...interface{}) {
-	entry.Log(level, fmt.Sprintf(format, args...))
+	if entry.Logger.IsLevelEnabled(level) {
+		entry.Log(level, fmt.Sprintf(format, args...))
+	}
 }
 
 func (entry *Entry) Tracef(format string, args ...interface{}) {
diff --git a/vendor/github.com/sirupsen/logrus/exported.go b/vendor/github.com/sirupsen/logrus/exported.go
index 7342613c..62fc2f21 100644
--- a/vendor/github.com/sirupsen/logrus/exported.go
+++ b/vendor/github.com/sirupsen/logrus/exported.go
@@ -1,6 +1,7 @@
 package logrus
 
 import (
+	"context"
 	"io"
 	"time"
 )
@@ -55,6 +56,11 @@ func WithError(err error) *Entry {
 	return std.WithField(ErrorKey, err)
 }
 
+// WithContext creates an entry from the standard logger and adds a context to it.
+func WithContext(ctx context.Context) *Entry {
+	return std.WithContext(ctx)
+}
+
 // WithField creates an entry from the standard logger and adds a field to
 // it. If you want multiple fields, use `WithFields`.
 //
diff --git a/vendor/github.com/sirupsen/logrus/go.mod b/vendor/github.com/sirupsen/logrus/go.mod
index 94574cc6..12fdf989 100644
--- a/vendor/github.com/sirupsen/logrus/go.mod
+++ b/vendor/github.com/sirupsen/logrus/go.mod
@@ -6,6 +6,5 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/objx v0.1.1 // indirect
 	github.com/stretchr/testify v1.2.2
-	golang.org/x/crypto v0.0.0-20180904163835-0709b304e793
-	golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33
+	golang.org/x/sys v0.0.0-20190422165155-953cdadca894
 )
diff --git a/vendor/github.com/sirupsen/logrus/go.sum b/vendor/github.com/sirupsen/logrus/go.sum
index 133d34ae..596c318b 100644
--- a/vendor/github.com/sirupsen/logrus/go.sum
+++ b/vendor/github.com/sirupsen/logrus/go.sum
@@ -2,6 +2,7 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/konsorten/go-windows-terminal-sequences v0.0.0-20180402223658-b729f2633dfe h1:CHRGQ8V7OlCYtwaKPJi3iA7J+YdNKdo8j7nG5IgDhjs=
 github.com/konsorten/go-windows-terminal-sequences v0.0.0-20180402223658-b729f2633dfe/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
@@ -9,7 +10,7 @@ github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-golang.org/x/crypto v0.0.0-20180904163835-0709b304e793 h1:u+LnwYTOOW7Ukr/fppxEb1Nwz0AtPflrblfvUudpo+I=
-golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33 h1:I6FyU15t786LL7oL/hn43zqTuEGr4PN7F4XJ1p4E3Y8=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/vendor/github.com/sirupsen/logrus/json_formatter.go b/vendor/github.com/sirupsen/logrus/json_formatter.go
index 26057535..098a21a0 100644
--- a/vendor/github.com/sirupsen/logrus/json_formatter.go
+++ b/vendor/github.com/sirupsen/logrus/json_formatter.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"runtime"
 )
 
 type fieldKey string
@@ -42,6 +43,12 @@ type JSONFormatter struct {
 	// }
 	FieldMap FieldMap
 
+	// CallerPrettyfier can be set by the user to modify the content
+	// of the function and file keys in the json data when ReportCaller is
+	// activated. If any of the returned value is the empty string the
+	// corresponding key will be removed from json fields.
+	CallerPrettyfier func(*runtime.Frame) (function string, file string)
+
 	// PrettyPrint will indent all json logs
 	PrettyPrint bool
 }
@@ -82,8 +89,17 @@ func (f *JSONFormatter) Format(entry *Entry) ([]byte, error) {
 	data[f.FieldMap.resolve(FieldKeyMsg)] = entry.Message
 	data[f.FieldMap.resolve(FieldKeyLevel)] = entry.Level.String()
 	if entry.HasCaller() {
-		data[f.FieldMap.resolve(FieldKeyFunc)] = entry.Caller.Function
-		data[f.FieldMap.resolve(FieldKeyFile)] = fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+		funcVal := entry.Caller.Function
+		fileVal := fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+		if f.CallerPrettyfier != nil {
+			funcVal, fileVal = f.CallerPrettyfier(entry.Caller)
+		}
+		if funcVal != "" {
+			data[f.FieldMap.resolve(FieldKeyFunc)] = funcVal
+		}
+		if fileVal != "" {
+			data[f.FieldMap.resolve(FieldKeyFile)] = fileVal
+		}
 	}
 
 	var b *bytes.Buffer
@@ -98,7 +114,7 @@ func (f *JSONFormatter) Format(entry *Entry) ([]byte, error) {
 		encoder.SetIndent("", "  ")
 	}
 	if err := encoder.Encode(data); err != nil {
-		return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
+		return nil, fmt.Errorf("failed to marshal fields to JSON, %v", err)
 	}
 
 	return b.Bytes(), nil
diff --git a/vendor/github.com/sirupsen/logrus/logger.go b/vendor/github.com/sirupsen/logrus/logger.go
index 9bf64e22..c0c0b1e5 100644
--- a/vendor/github.com/sirupsen/logrus/logger.go
+++ b/vendor/github.com/sirupsen/logrus/logger.go
@@ -1,6 +1,7 @@
 package logrus
 
 import (
+	"context"
 	"io"
 	"os"
 	"sync"
@@ -124,6 +125,13 @@ func (logger *Logger) WithError(err error) *Entry {
 	return entry.WithError(err)
 }
 
+// Add a context to the log entry.
+func (logger *Logger) WithContext(ctx context.Context) *Entry {
+	entry := logger.newEntry()
+	defer logger.releaseEntry(entry)
+	return entry.WithContext(ctx)
+}
+
 // Overrides the time of the log entry.
 func (logger *Logger) WithTime(t time.Time) *Entry {
 	entry := logger.newEntry()
@@ -200,7 +208,7 @@ func (logger *Logger) Info(args ...interface{}) {
 
 func (logger *Logger) Print(args ...interface{}) {
 	entry := logger.newEntry()
-	entry.Info(args...)
+	entry.Print(args...)
 	logger.releaseEntry(entry)
 }
 
@@ -256,7 +264,7 @@ func (logger *Logger) Warnln(args ...interface{}) {
 }
 
 func (logger *Logger) Warningln(args ...interface{}) {
-	logger.Warn(args...)
+	logger.Warnln(args...)
 }
 
 func (logger *Logger) Errorln(args ...interface{}) {
diff --git a/vendor/github.com/sirupsen/logrus/logrus.go b/vendor/github.com/sirupsen/logrus/logrus.go
index c1ca8899..8644761f 100644
--- a/vendor/github.com/sirupsen/logrus/logrus.go
+++ b/vendor/github.com/sirupsen/logrus/logrus.go
@@ -74,7 +74,7 @@ func (level Level) MarshalText() ([]byte, error) {
 		return []byte("panic"), nil
 	}
 
-	return nil, fmt.Errorf("not a valid lorus level %q", level)
+	return nil, fmt.Errorf("not a valid logrus level %d", level)
 }
 
 // A constant exposing all logging levels
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_aix.go b/vendor/github.com/sirupsen/logrus/terminal_check_aix.go
deleted file mode 100644
index 04fdb7ba..00000000
--- a/vendor/github.com/sirupsen/logrus/terminal_check_aix.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// +build !appengine,!js,!windows,aix
-
-package logrus
-
-import "io"
-
-func checkIfTerminal(w io.Writer) bool {
-	return false
-}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_bsd.go b/vendor/github.com/sirupsen/logrus/terminal_check_bsd.go
new file mode 100644
index 00000000..3c4f43f9
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_bsd.go
@@ -0,0 +1,13 @@
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package logrus
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TIOCGETA
+
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
+	return err == nil
+}
+
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_js.go b/vendor/github.com/sirupsen/logrus/terminal_check_no_terminal.go
index 0c209750..97af92c6 100644
--- a/vendor/github.com/sirupsen/logrus/terminal_check_js.go
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_no_terminal.go
@@ -1,4 +1,4 @@
-// +build js
+// +build js nacl plan9
 
 package logrus
 
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_notappengine.go b/vendor/github.com/sirupsen/logrus/terminal_check_notappengine.go
index d4655650..3293fb3c 100644
--- a/vendor/github.com/sirupsen/logrus/terminal_check_notappengine.go
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_notappengine.go
@@ -1,18 +1,16 @@
-// +build !appengine,!js,!windows,!aix
+// +build !appengine,!js,!windows,!nacl,!plan9
 
 package logrus
 
 import (
 	"io"
 	"os"
-
-	"golang.org/x/crypto/ssh/terminal"
 )
 
 func checkIfTerminal(w io.Writer) bool {
 	switch v := w.(type) {
 	case *os.File:
-		return terminal.IsTerminal(int(v.Fd()))
+		return isTerminal(int(v.Fd()))
 	default:
 		return false
 	}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_solaris.go b/vendor/github.com/sirupsen/logrus/terminal_check_solaris.go
new file mode 100644
index 00000000..f6710b3b
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_solaris.go
@@ -0,0 +1,11 @@
+package logrus
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermio(fd, unix.TCGETA)
+	return err == nil
+}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_unix.go b/vendor/github.com/sirupsen/logrus/terminal_check_unix.go
new file mode 100644
index 00000000..355dc966
--- /dev/null
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_unix.go
@@ -0,0 +1,13 @@
+// +build linux aix
+
+package logrus
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TCGETS
+
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
+	return err == nil
+}
+
diff --git a/vendor/github.com/sirupsen/logrus/terminal_check_windows.go b/vendor/github.com/sirupsen/logrus/terminal_check_windows.go
index 3b9d2864..572889db 100644
--- a/vendor/github.com/sirupsen/logrus/terminal_check_windows.go
+++ b/vendor/github.com/sirupsen/logrus/terminal_check_windows.go
@@ -6,15 +6,29 @@ import (
 	"io"
 	"os"
 	"syscall"
+
+	sequences "github.com/konsorten/go-windows-terminal-sequences"
 )
 
+func initTerminal(w io.Writer) {
+	switch v := w.(type) {
+	case *os.File:
+		sequences.EnableVirtualTerminalProcessing(syscall.Handle(v.Fd()), true)
+	}
+}
+
 func checkIfTerminal(w io.Writer) bool {
+	var ret bool
 	switch v := w.(type) {
 	case *os.File:
 		var mode uint32
 		err := syscall.GetConsoleMode(syscall.Handle(v.Fd()), &mode)
-		return err == nil
+		ret = (err == nil)
 	default:
-		return false
+		ret = false
+	}
+	if ret {
+		initTerminal(w)
 	}
+	return ret
 }
diff --git a/vendor/github.com/sirupsen/logrus/terminal_notwindows.go b/vendor/github.com/sirupsen/logrus/terminal_notwindows.go
deleted file mode 100644
index 3dbd2372..00000000
--- a/vendor/github.com/sirupsen/logrus/terminal_notwindows.go
+++ /dev/null
@@ -1,8 +0,0 @@
-// +build !windows
-
-package logrus
-
-import "io"
-
-func initTerminal(w io.Writer) {
-}
diff --git a/vendor/github.com/sirupsen/logrus/terminal_windows.go b/vendor/github.com/sirupsen/logrus/terminal_windows.go
deleted file mode 100644
index b4ef5286..00000000
--- a/vendor/github.com/sirupsen/logrus/terminal_windows.go
+++ /dev/null
@@ -1,18 +0,0 @@
-// +build !appengine,!js,windows
-
-package logrus
-
-import (
-	"io"
-	"os"
-	"syscall"
-
-	sequences "github.com/konsorten/go-windows-terminal-sequences"
-)
-
-func initTerminal(w io.Writer) {
-	switch v := w.(type) {
-	case *os.File:
-		sequences.EnableVirtualTerminalProcessing(syscall.Handle(v.Fd()), true)
-	}
-}
diff --git a/vendor/github.com/sirupsen/logrus/text_formatter.go b/vendor/github.com/sirupsen/logrus/text_formatter.go
index fb21649c..e01587c4 100644
--- a/vendor/github.com/sirupsen/logrus/text_formatter.go
+++ b/vendor/github.com/sirupsen/logrus/text_formatter.go
@@ -12,18 +12,13 @@ import (
 )
 
 const (
-	nocolor = 0
-	red     = 31
-	green   = 32
-	yellow  = 33
-	blue    = 36
-	gray    = 37
+	red    = 31
+	yellow = 33
+	blue   = 36
+	gray   = 37
 )
 
-var (
-	baseTimestamp time.Time
-	emptyFieldMap FieldMap
-)
+var baseTimestamp time.Time
 
 func init() {
 	baseTimestamp = time.Now()
@@ -77,16 +72,18 @@ type TextFormatter struct {
 	//         FieldKeyMsg:   "@message"}}
 	FieldMap FieldMap
 
+	// CallerPrettyfier can be set by the user to modify the content
+	// of the function and file keys in the data when ReportCaller is
+	// activated. If any of the returned value is the empty string the
+	// corresponding key will be removed from fields.
+	CallerPrettyfier func(*runtime.Frame) (function string, file string)
+
 	terminalInitOnce sync.Once
 }
 
 func (f *TextFormatter) init(entry *Entry) {
 	if entry.Logger != nil {
 		f.isTerminal = checkIfTerminal(entry.Logger.Out)
-
-		if f.isTerminal {
-			initTerminal(entry.Logger.Out)
-		}
 	}
 }
 
@@ -118,6 +115,8 @@ func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 		keys = append(keys, k)
 	}
 
+	var funcVal, fileVal string
+
 	fixedKeys := make([]string, 0, 4+len(data))
 	if !f.DisableTimestamp {
 		fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyTime))
@@ -130,8 +129,19 @@ func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 		fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyLogrusError))
 	}
 	if entry.HasCaller() {
-		fixedKeys = append(fixedKeys,
-			f.FieldMap.resolve(FieldKeyFunc), f.FieldMap.resolve(FieldKeyFile))
+		if f.CallerPrettyfier != nil {
+			funcVal, fileVal = f.CallerPrettyfier(entry.Caller)
+		} else {
+			funcVal = entry.Caller.Function
+			fileVal = fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+		}
+
+		if funcVal != "" {
+			fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyFunc))
+		}
+		if fileVal != "" {
+			fixedKeys = append(fixedKeys, f.FieldMap.resolve(FieldKeyFile))
+		}
 	}
 
 	if !f.DisableSorting {
@@ -166,6 +176,7 @@ func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 	if f.isColored() {
 		f.printColored(b, entry, keys, data, timestampFormat)
 	} else {
+
 		for _, key := range fixedKeys {
 			var value interface{}
 			switch {
@@ -178,9 +189,9 @@ func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 			case key == f.FieldMap.resolve(FieldKeyLogrusError):
 				value = entry.err
 			case key == f.FieldMap.resolve(FieldKeyFunc) && entry.HasCaller():
-				value = entry.Caller.Function
+				value = funcVal
 			case key == f.FieldMap.resolve(FieldKeyFile) && entry.HasCaller():
-				value = fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+				value = fileVal
 			default:
 				value = data[key]
 			}
@@ -215,10 +226,21 @@ func (f *TextFormatter) printColored(b *bytes.Buffer, entry *Entry, keys []strin
 	entry.Message = strings.TrimSuffix(entry.Message, "\n")
 
 	caller := ""
-
 	if entry.HasCaller() {
-		caller = fmt.Sprintf("%s:%d %s()",
-			entry.Caller.File, entry.Caller.Line, entry.Caller.Function)
+		funcVal := fmt.Sprintf("%s()", entry.Caller.Function)
+		fileVal := fmt.Sprintf("%s:%d", entry.Caller.File, entry.Caller.Line)
+
+		if f.CallerPrettyfier != nil {
+			funcVal, fileVal = f.CallerPrettyfier(entry.Caller)
+		}
+
+		if fileVal == "" {
+			caller = funcVal
+		} else if funcVal == "" {
+			caller = fileVal
+		} else {
+			caller = fileVal + " " + funcVal
+		}
 	}
 
 	if f.DisableTimestamp {
diff --git a/vendor/github.com/spf13/viper/go.mod b/vendor/github.com/spf13/viper/go.mod
index 86e801c1..27943005 100644
--- a/vendor/github.com/spf13/viper/go.mod
+++ b/vendor/github.com/spf13/viper/go.mod
@@ -2,23 +2,42 @@ module github.com/spf13/viper
 
 require (
 	github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 // indirect
+	github.com/coreos/bbolt v1.3.2 // indirect
 	github.com/coreos/etcd v3.3.10+incompatible // indirect
-	github.com/coreos/go-etcd v2.0.0+incompatible // indirect
 	github.com/coreos/go-semver v0.2.0 // indirect
+	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e // indirect
+	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
 	github.com/fsnotify/fsnotify v1.4.7
+	github.com/gogo/protobuf v1.2.1 // indirect
+	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
+	github.com/google/btree v1.0.0 // indirect
+	github.com/gorilla/websocket v1.4.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway v1.9.0 // indirect
 	github.com/hashicorp/hcl v1.0.0
+	github.com/jonboulle/clockwork v0.1.0 // indirect
 	github.com/magiconair/properties v1.8.0
 	github.com/mitchellh/mapstructure v1.1.2
 	github.com/pelletier/go-toml v1.2.0
+	github.com/prometheus/client_golang v0.9.3 // indirect
+	github.com/soheilhy/cmux v0.1.4 // indirect
 	github.com/spf13/afero v1.1.2
 	github.com/spf13/cast v1.3.0
 	github.com/spf13/jwalterweatherman v1.0.0
 	github.com/spf13/pflag v1.0.3
 	github.com/stretchr/testify v1.2.2
-	github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8 // indirect
+	github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
+	github.com/ugorji/go v1.1.4 // indirect
+	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
 	github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77
-	golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9 // indirect
-	golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a // indirect
-	golang.org/x/text v0.3.0 // indirect
+	go.etcd.io/bbolt v1.3.2 // indirect
+	go.uber.org/atomic v1.4.0 // indirect
+	go.uber.org/multierr v1.1.0 // indirect
+	go.uber.org/zap v1.10.0 // indirect
+	golang.org/x/net v0.0.0-20190522155817-f3200d17e092 // indirect
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
+	google.golang.org/grpc v1.21.0 // indirect
 	gopkg.in/yaml.v2 v2.2.2
 )
diff --git a/vendor/github.com/spf13/viper/go.sum b/vendor/github.com/spf13/viper/go.sum
index 22d60745..97afaffe 100644
--- a/vendor/github.com/spf13/viper/go.sum
+++ b/vendor/github.com/spf13/viper/go.sum
@@ -1,25 +1,109 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 h1:G1bPvciwNyF7IUmKXNt9Ak3m6u9DE1rF+RmtIkBpVdA=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/coreos/etcd v3.3.10+incompatible h1:KjVWqrZ5U0wa3CxY2AxlH6/UcB+PK2td1DcsYhA+HRs=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/coreos/bbolt v1.3.2 h1:wZwiHHUieZCquLkDL0B8UhzreNWsPHooDAG3q34zk0s=
+github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
+github.com/coreos/etcd v3.3.10+incompatible h1:jFneRYjIvLMLhDLCzuTuU4rSJUjRplcJQ7pD7MnhC04=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible h1:bXhRBIXoTm9BYHS3gE0TtQuyNZyeEMux2sDi4oo5YOo=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
 github.com/coreos/go-semver v0.2.0 h1:3Jm3tLmsgAYcjC+4Up7hJrFBPr+n7rAqYeSw/SZazuY=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e h1:Wf6HqHfScWJN9/ZjdUKyjop4mf3Qdd+1TvvltAvM3m8=
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f h1:lBNOc5arjvs8E5mO2tbpBpLoyyu8B6e44T7hJy6potg=
+github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
+github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/ghodss/yaml v1.0.0 h1:wQHKEahhL6wmXdzwWG11gIVCkOv05bNOh+Rxn0yngAk=
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
+github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
+github.com/gogo/protobuf v1.2.1 h1:/s5zKNz0uPFCZ5hddgPdo2TK2TVrUNMn0OOX8/aZMTE=
+github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef h1:veQD95Isof8w9/WXiA+pa3tz3fJXkt5B7QaRBrM62gk=
+github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/google/btree v1.0.0 h1:0udJVsspx3VBr5FwtLhQQtuAsVc79tTq0ocGIPAU6qo=
+github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/gorilla/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
+github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 h1:Iju5GlWwrvL6UBg4zJJt3btmonfrMlCDdsejg4CZE7c=
+github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
+github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 h1:Ovs26xHkKqVztRpIrF/92BcuyuQ/YW4NSIpoGtfXNho=
+github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
+github.com/grpc-ecosystem/grpc-gateway v1.9.0 h1:bM6ZAFZmc/wPFaRDi0d5L7hGEZEx/2u+Tmr2evNHDiI=
+github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
+github.com/jonboulle/clockwork v0.1.0 h1:VKV+ZcuP6l3yW9doeqz6ziZGgcynBVQO+obU0+0hcPo=
+github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
+github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
+github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/magiconair/properties v1.8.0 h1:LLgXmsheXeRoUOBOjtwPQCWIYqM/LU1ayDtDePerRcY=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
+github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
+github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/pelletier/go-toml v1.2.0 h1:T5zMGML61Wp+FlcbWjRDT7yAxhJNAiPPLOFECq181zc=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
+github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
+github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
+github.com/prometheus/client_golang v0.9.3 h1:9iH4JKXLzFbOAdtqv/a+j8aewx2Y8lAjAydhbaScPF8=
+github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
+github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
+github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 h1:S/YWwWx/RA8rT8tKFRuGUZhuA90OyIBpPCXkcbwU8DE=
+github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
+github.com/prometheus/common v0.4.0 h1:7etb9YClo3a6HjLzfl6rIQaU+FDfi0VSX39io3aQ+DM=
+github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
+github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084 h1:sofwID9zm4tzrgykg80hfFph1mryUeLRsUfoocVVmRY=
+github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
+github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
+github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
+github.com/sirupsen/logrus v1.2.0 h1:juTguoYk5qI21pwyTXY3B3Y5cOTH3ZUyZCg1v/mihuo=
+github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
+github.com/soheilhy/cmux v0.1.4 h1:0HKaf1o97UwFjHH9o5XsHUOF+tqmdA7KEzXLpiyaw0E=
+github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
+github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spf13/afero v1.1.2 h1:m8/z1t7/fwjysjQRYbP0RD+bUIF/8tJwPdEZsI83ACI=
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
 github.com/spf13/cast v1.3.0 h1:oget//CVOEoFewqQxwr0Ej5yjygnqGkvggSE/gB35Q8=
@@ -28,24 +112,67 @@ github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.2.3-0.20181014000028-04af85275a5c h1:03OmljzZYsezlgAfa+f/cY8E8XXPiFh5bgANMhUlDI4=
-github.com/stretchr/testify v1.2.3-0.20181014000028-04af85275a5c/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.2.3-0.20181115233458-8019298d9fa5 h1:ixuBiBNIIQ3RKRSZy9B0DgaqreXG6NDHrbwAFGg8Mwk=
-github.com/stretchr/testify v1.2.3-0.20181115233458-8019298d9fa5/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8 h1:3SVOIvH7Ae1KRYyQWRjXWJEA9sS/c/pjvH++55Gr648=
-github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
-github.com/xordataexchange/crypt v0.0.2 h1:VBfFXTpEwLq2hzs42qCHOyKw5AqEm9DYGqBuINmzUZY=
-github.com/xordataexchange/crypt v0.0.2/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
+github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 h1:LnC5Kc/wtumK+WB441p7ynQJzVuNRJiqddSIE3IlSEQ=
+github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
+github.com/ugorji/go v1.1.4 h1:j4s+tAvLfL3bZyefP2SEWmhBzmuIlH/eqNuPdFPgngw=
+github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
+github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 h1:eY9dn8+vbi4tKz5Qo6v2eYzo7kUS51QINcR5jNpbZS8=
+github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77 h1:ESFSdwYZvkeru3RtdrYueztKhOBCSAAzS4Gf+k0tEow=
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
-golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9 h1:mKdxBk7AujPs8kU4m80U72y/zjbZ3UcXC7dClwKbUI0=
-golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a h1:1n5lsVfiQW3yfsRGu98756EH1YthsFqr/5mxHduZW2A=
-golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+go.etcd.io/bbolt v1.3.2 h1:Z/90sZLPOeCy2PwprqkFa25PdkusRzaj9P8zm/KNyvk=
+go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
+go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU=
+go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.uber.org/multierr v1.1.0 h1:HoEmRHQPVSqub6w2z2d2EOVs2fjyFRGyofhKuyDq0QI=
+go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
+go.uber.org/zap v1.10.0 h1:ORx85nbTijNz8ljznvCMR1ZBIPKFn3jQrag10X2AsuM=
+go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
+golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
+golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190522155817-f3200d17e092 h1:4QSRKanuywn15aTZvI/mIDEgPQpswuFndXpOj3rKEco=
+golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
+golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.21.0 h1:G+97AoqBnmZIT91cLG/EkCoK9NSelj64P8bOHHNmGn0=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/vendor/github.com/spf13/viper/viper.go b/vendor/github.com/spf13/viper/viper.go
index cee37b21..a3d37f8c 100644
--- a/vendor/github.com/spf13/viper/viper.go
+++ b/vendor/github.com/spf13/viper/viper.go
@@ -180,10 +180,11 @@ type Viper struct {
 	remoteProviders []*defaultRemoteProvider
 
 	// Name of file to look for inside the path
-	configName string
-	configFile string
-	configType string
-	envPrefix  string
+	configName        string
+	configFile        string
+	configType        string
+	configPermissions os.FileMode
+	envPrefix         string
 
 	automaticEnvApplied bool
 	envKeyReplacer      *strings.Replacer
@@ -210,6 +211,7 @@ func New() *Viper {
 	v := new(Viper)
 	v.keyDelim = "."
 	v.configName = "config"
+	v.configPermissions = os.FileMode(0644)
 	v.fs = afero.NewOsFs()
 	v.config = make(map[string]interface{})
 	v.override = make(map[string]interface{})
@@ -687,6 +689,12 @@ func (v *Viper) Get(key string) interface{} {
 			return cast.ToString(val)
 		case int32, int16, int8, int:
 			return cast.ToInt(val)
+		case uint:
+			return cast.ToUint(val)
+		case uint32:
+			return cast.ToUint32(val)
+		case uint64:
+			return cast.ToUint64(val)
 		case int64:
 			return cast.ToInt64(val)
 		case float64, float32:
@@ -750,6 +758,24 @@ func (v *Viper) GetInt64(key string) int64 {
 	return cast.ToInt64(v.Get(key))
 }
 
+// GetUint returns the value associated with the key as an unsigned integer.
+func GetUint(key string) uint { return v.GetUint(key) }
+func (v *Viper) GetUint(key string) uint {
+	return cast.ToUint(v.Get(key))
+}
+
+// GetUint32 returns the value associated with the key as an unsigned integer.
+func GetUint32(key string) uint32 { return v.GetUint32(key) }
+func (v *Viper) GetUint32(key string) uint32 {
+	return cast.ToUint32(v.Get(key))
+}
+
+// GetUint64 returns the value associated with the key as an unsigned integer.
+func GetUint64(key string) uint64 { return v.GetUint64(key) }
+func (v *Viper) GetUint64(key string) uint64 {
+	return cast.ToUint64(v.Get(key))
+}
+
 // GetFloat64 returns the value associated with the key as a float64.
 func GetFloat64(key string) float64 { return v.GetFloat64(key) }
 func (v *Viper) GetFloat64(key string) float64 {
@@ -811,8 +837,6 @@ func (v *Viper) UnmarshalKey(key string, rawVal interface{}, opts ...DecoderConf
 		return err
 	}
 
-	v.insensitiviseMaps()
-
 	return nil
 }
 
@@ -828,8 +852,6 @@ func (v *Viper) Unmarshal(rawVal interface{}, opts ...DecoderConfigOption) error
 		return err
 	}
 
-	v.insensitiviseMaps()
-
 	return nil
 }
 
@@ -872,8 +894,6 @@ func (v *Viper) UnmarshalExact(rawVal interface{}) error {
 		return err
 	}
 
-	v.insensitiviseMaps()
-
 	return nil
 }
 
@@ -1334,7 +1354,7 @@ func (v *Viper) writeConfig(filename string, force bool) error {
 			return fmt.Errorf("File: %s exists. Use WriteConfig to overwrite.", filename)
 		}
 	}
-	f, err := v.fs.OpenFile(filename, flags, os.FileMode(0644))
+	f, err := v.fs.OpenFile(filename, flags, v.configPermissions)
 	if err != nil {
 		return err
 	}
@@ -1579,13 +1599,6 @@ func (v *Viper) WatchRemoteConfigOnChannel() error {
 	return v.watchKeyValueConfigOnChannel()
 }
 
-func (v *Viper) insensitiviseMaps() {
-	insensitiviseMap(v.config)
-	insensitiviseMap(v.defaults)
-	insensitiviseMap(v.override)
-	insensitiviseMap(v.kvstore)
-}
-
 // Retrieve the first found remote configuration.
 func (v *Viper) getKeyValueConfig() error {
 	if RemoteConfig == nil {
@@ -1778,6 +1791,12 @@ func (v *Viper) SetConfigType(in string) {
 	}
 }
 
+// SetConfigPermissions sets the permissions for the config file.
+func SetConfigPermissions(perm os.FileMode) { v.SetConfigPermissions(perm) }
+func (v *Viper) SetConfigPermissions(perm os.FileMode) {
+	v.configPermissions = perm.Perm()
+}
+
 func (v *Viper) getConfigType() string {
 	if v.configType != "" {
 		return v.configType
diff --git a/vendor/github.com/valyala/fasttemplate/go.mod b/vendor/github.com/valyala/fasttemplate/go.mod
new file mode 100644
index 00000000..6015c4b5
--- /dev/null
+++ b/vendor/github.com/valyala/fasttemplate/go.mod
@@ -0,0 +1,3 @@
+module github.com/valyala/fasttemplate
+
+require github.com/valyala/bytebufferpool v1.0.0
diff --git a/vendor/github.com/valyala/fasttemplate/go.sum b/vendor/github.com/valyala/fasttemplate/go.sum
new file mode 100644
index 00000000..c10c48c2
--- /dev/null
+++ b/vendor/github.com/valyala/fasttemplate/go.sum
@@ -0,0 +1,2 @@
+github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
+github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
diff --git a/vendor/github.com/zfjagann/golang-ring/ring.go b/vendor/github.com/zfjagann/golang-ring/ring.go
index 6d2a7e24..345ee8cd 100644
--- a/vendor/github.com/zfjagann/golang-ring/ring.go
+++ b/vendor/github.com/zfjagann/golang-ring/ring.go
@@ -56,7 +56,7 @@ func (r *Ring) ContentSize() int {
 	} else {
 		difference := (r.head - r.tail)
 		if difference < 0 {
-			difference = -difference
+			difference += r.capacity()
 		}
 		return difference + 1
 	}