From 325d62b41c03f0530513a4f404cc8d7349b6885b Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Tue, 5 Mar 2019 23:08:54 +0100
Subject: Update vendor d5/tengo

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 vendor/github.com/d5/tengo/README.md | 74 ++++++++++++++++++++++++++++++++++++
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+<p align="center">
+  <img src="https://raw.githubusercontent.com/d5/tengolang.com/master/logo_400.png" width="200" height="200">
+</p>
+
+# The Tengo Language
+
+[![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)
+[![](https://img.shields.io/badge/Support%20Tengo-%241-brightgreen.svg)](https://www.patreon.com/tengolang)
+
+**Tengo is a small, dynamic, fast, secure script language for Go.** 
+
+Tengo is **[fast](#benchmark)** and secure because it's compiled/executed as bytecode on stack-based VM that's written in native Go.
+
+```golang
+/* The Tengo Language */
+
+each := func(seq, fn) {
+    for x in seq { fn(x) }
+}
+
+sum := func(init, seq) {
+    each(seq, func(x) { init += x })
+    return init
+}
+
+n := sum(0, [1, 2, 3])   // == 6
+s := sum("", [1, 2, 3])  // == "123"
+```
+
+> Run this code in the [Playground](https://tengolang.com/?s=d01cf9ed81daba939e26618530eb171f7397d9c9)
+
+## Features
+
+- Simple and highly readable [Syntax](https://github.com/d5/tengo/blob/master/docs/tutorial.md)
+  - Dynamic typing with type coercion
+  - Higher-order functions and closures
+  - Immutable values
+  - Garbage collection
+- [Securely Embeddable](https://github.com/d5/tengo/blob/master/docs/interoperability.md) and [Extensible](https://github.com/d5/tengo/blob/master/docs/objects.md)
+- Compiler/runtime written in native Go _(no external deps or cgo)_
+- Executable as a [standalone](https://github.com/d5/tengo/blob/master/docs/tengo-cli.md) language / REPL
+
+## Benchmark
+
+| | fib(35) | fibt(35) |  Type  |
+| :--- |    ---: |     ---: |  :---: |
+| Go | `58ms` | `4ms` | Go (native) |
+| [**Tengo**](https://github.com/d5/tengo) | `4,180ms` | `5ms` | VM on Go |
+| Lua | `1,695ms` | `3ms` | Lua (native) |
+| [go-lua](https://github.com/Shopify/go-lua) | `5,163ms` | `5ms` | Lua VM on Go |
+| [GopherLua](https://github.com/yuin/gopher-lua) | `5,525ms` | `5ms` | Lua VM on Go |
+| Python | `3,097ms` | `27ms` | Python (native) |
+| [starlark-go](https://github.com/google/starlark-go) | `15,307ms` | `5ms` | Python-like Interpreter on Go |
+| [gpython](https://github.com/go-python/gpython) | `17,656ms` | `5ms` | Python Interpreter on Go |
+| [goja](https://github.com/dop251/goja) | `6,876ms` | `5ms` | JS VM on Go |
+| [otto](https://github.com/robertkrimen/otto) | `81,886ms` | `12ms` | JS Interpreter on Go |
+| [Anko](https://github.com/mattn/anko) | `97,517ms` | `14ms` | Interpreter on Go |
+
+_* [fib(35)](https://github.com/d5/tengobench/blob/master/code/fib.tengo): Fibonacci(35)_  
+_* [fibt(35)](https://github.com/d5/tengobench/blob/master/code/fibtc.tengo): [tail-call](https://en.wikipedia.org/wiki/Tail_call) version of Fibonacci(35)_  
+_* **Go** does not read the source code from file, while all other cases do_  
+_* See [here](https://github.com/d5/tengobench) for commands/codes used_
+
+## References
+
+- [Language Syntax](https://github.com/d5/tengo/blob/master/docs/tutorial.md)
+- [Object Types](https://github.com/d5/tengo/blob/master/docs/objects.md)
+- [Runtime Types](https://github.com/d5/tengo/blob/master/docs/runtime-types.md) and [Operators](https://github.com/d5/tengo/blob/master/docs/operators.md)
+- [Builtin Functions](https://github.com/d5/tengo/blob/master/docs/builtins.md)
+- [Interoperability](https://github.com/d5/tengo/blob/master/docs/interoperability.md)
+- [Tengo CLI](https://github.com/d5/tengo/blob/master/docs/tengo-cli.md)
+- [Standard Library](https://github.com/d5/tengo/blob/master/docs/stdlib.md)
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