adding CHANGELOG

CHANGELOG.md

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+# TBD
+
+TODO
+
+Features:
+
+- [FEATURE #74](https://github.com/jasonwilliams/boa/issues/74):
+  Enables Boa to run within the Test 262 framework.  
+  This will help us see what is implemented or not within the spec
+
+# 0.4.0 (2019-09-25)
+
+v0.4.0 brings quite a big release. The biggest feature to land is the support of regular expressions.  
+Functions now have the arguments object supported and we have a [`debugging`](docs/debugging.md) section in the docs.
+
+Feature enhancements:
+
+- [FEATURE #6](https://github.com/jasonwilliams/boa/issues/6):
+  Support for regex literals. (Big thanks @999eagle)
+- [FEATURE #13](https://github.com/jasonwilliams/boa/issues/13):
+  toLowerCase, toUpperCase, substring, substr and valueOf implemented (thanks @arbroween)
+- Support for `arguments` object within functions
+- `StringData` instead of `PrimitieData` to match spec
+- Native function signatures changed, operations added to match spec
+- Primitives can now be boxed/unboxed when methods are ran on them
+- Spelling edits (thanks @someguynamedmatt)
+- Ability to set global values before interpreter starts (thanks @999eagle)
+- Assign operators implemented (thanks @oll3)
+-
+
+Bug fixes:
+
+- [BUG #57](https://github.com/jasonwilliams/boa/issues/57):
+  Fixed issue with stackoverflow by implementing early returns.
+- Allow to re-assign value to an existing binding. (Thanks @oll3)
+
+# 0.3.0 (2019-07-26)
+
+- UnexpectedKeyword(Else) bug fixed https://github.com/jasonwilliams/boa/issues/38
+- Contributing guide added
+- Ability to specify file - Thanks @callumquick
+- Travis fixes
+- Parser Tests - Thanks @Razican
+- Migrate to dyn traits - Thanks @Atul9
+- Added implementations for Array.prototype: concat(), push(), pop() and join() - Thanks @callumquick
+- Some clippy Issues fixed - Thanks @Razican
+- Objects have been refactored to use structs which are more closely aligned with the specification
+- Benchmarks have been added
+- String and Array specific console.log formats - Thanks @callumquick
+- isPropertyKey implementation added - Thanks @KrisChambers
+- Unit Tests for Array and Strings - Thanks @GalAster
+- typo fix - Thanks @palerdot
+- dist cleanup, thanks @zgotsch
+
+# 0.2.1 (2019-06-30)
+
+Some String prototype methods are implemented.  
+Thanks to @lennartbuit we have
+trim/trimStart/trimEnd added to the string prototype
+
+Feature enhancements:
+
+- [String.prototype.concat ( ...args )](https://tc39.es/ecma262/#sec-string.prototype.slice)
+- [String.prototype.endsWith ( searchString [ , endPosition ] )](https://tc39.es/ecma262/#sec-string.prototype.endswith)
+- [String.prototype.includes ( searchString [ , position ] )](https://tc39.es/ecma262/#sec-string.prototype.includes)
+- [String.prototype.indexOf ( searchString [ , position ] )](https://tc39.es/ecma262/#sec-string.prototype.indexof)
+- [String.prototype.lastIndexOf ( searchString [ , position ] )](https://tc39.es/ecma262/#sec-string.prototype.lastindexof)
+- [String.prototype.repeat ( count )](https://tc39.es/ecma262/#sec-string.prototype.repeat)
+- [String.prototype.slice ( start, end )](https://tc39.es/ecma262/#sec-string.prototype.slice)
+- [String.prototype.startsWith ( searchString [ , position ] )](https://tc39.es/ecma262/#sec-string.prototype.startswith)
+
+Bug fixes:
+
+- Plenty
+
+# 0.2.0 (2019-06-10)
+
+Working state reached
+
+- Tests on the lexer, conforms with puncturators and keywords from TC39 specification
+- wasm-bindgen added with working demo in Web Assembly
+- snapshot of boa in a working state for the first time