Add a change-log

CHANGELOG.md

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+Change Log
+==========
+
+This project honours [Semantic Versioning](http://semver.org).
+
+[Staged]: https://github.com/Alhadis/language-webassembly/compare/v1.1.0...HEAD
+
+
+[v1.1.0]
+------------------------------------------------------------------------
+**June 27th, 2017**  
+* __Added:__ Missing module-level keywords
+* __Added:__ Support for exponential floats and integers
+* __Added:__ Support for NaN constants with payloads. E.g. `nan:0xAF`
+* __Added:__ Support for variable-length unicode escapes. E.g, `\u{0AE}`
+* __Fixed:__ Incorrect opcode classification and matching
+
+[v1.1.0]: https://github.com/Alhadis/language-webassembly/releases/tag/v1.1.0
+
+
+[v1.0.1]
+------------------------------------------------------------------------
+**May 28th, 2017**  
+* __Added:__ Support for [hexadecimal notation][hexdec]
+* __Added:__ Support for `NaN` and `infinity` constants
+
+[v1.0.1]: https://github.com/Alhadis/language-webassembly/releases/tag/v1.0.1
+[hexdec]: http://webassembly.github.io/spec/text/values.html#integers
+
+
+[v1.0.0]
+------------------------------------------------------------------------
+**May 27th, 2017**  
+Initial release.
+
+Adds syntax highlighting to WebAssembly's textual representation.
+
+[v1.0.0]: https://github.com/Alhadis/language-webassembly/releases/tag/v1.0.0