Update to tengo v2 (#976)

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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)
-[![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.** 
-
-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 */
-
-fmt := import("fmt")
-
-each := func(seq, fn) {
-    for x in seq { fn(x) }
-}
-
-sum := func(init, seq) {
-    each(seq, func(x) { init += x })
-    return init
-}
-
-fmt.println(sum(0, [1, 2, 3]))   // "6"
-fmt.println(sum("", [1, 2, 3]))  // "123"
-```
-
-> Run this code in the [Playground](https://tengolang.com/?s=0c8d5d0d88f2795a7093d7f35ae12c3afa17bea3)
-
-## 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
-- Use cases: rules engine, [state machine](https://github.com/d5/go-fsm), [gaming](https://github.com/d5/pbr), data pipeline, [transpiler](https://github.com/d5/tengo2lua)
-
-## Benchmark
-
-| | fib(35) | fibt(35) |  Type  |
-| :--- |    ---: |     ---: |  :---: |
-| Go | `48ms` | `3ms` | Go (native) |
-| [**Tengo**](https://github.com/d5/tengo) | `2,349ms` | `5ms` | VM on Go |
-| Lua | `1,416ms` | `3ms` | Lua (native) |
-| [go-lua](https://github.com/Shopify/go-lua) | `4,402ms` | `5ms` | Lua VM on Go |
-| [GopherLua](https://github.com/yuin/gopher-lua) | `4,023ms` | `5ms` | Lua VM on Go |
-| Python | `2,588ms` | `26ms` | Python (native) |
-| [starlark-go](https://github.com/google/starlark-go) | `11,126ms` | `6ms` | Python-like Interpreter on Go |
-| [gpython](https://github.com/go-python/gpython) | `15,035ms` | `4ms` | Python Interpreter on Go |
-| [goja](https://github.com/dop251/goja) | `5,089ms` | `5ms` | JS VM on Go |
-| [otto](https://github.com/robertkrimen/otto) | `68,377ms` | `11ms` | JS Interpreter on Go |
-| [Anko](https://github.com/mattn/anko) | `92,579ms` | `18ms` | 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)