Add changelog

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+### Added
+- Version flag (-v) to CLI
+- Examples in markdown (also acts as tests)
+
+### Removed
+- Internal: Removed a lot of specs now covered by markdown examples
+
+### Fixed
+- Strict flag that was broken in CLI
+
+## [0.2.0] - 2015-08-19
+### Added
+- Transpile proc var assignment to function definitions
+- Transpile global variables
+- Transpile `self` to `this`
+- Transpile type aliases
+- Transpile `is_a?` to `instanceof`
+- Transpile vars; bool, number and string literals explicitly
+- Transpile `case/when` to `switch/case`
+- Transpile `rescue` to `catch`
+
+### Changed
+- [Strict mode](https://github.com/geppetto-apps/crow/pull/6) - Enabled by default, CLI will not
+  allow use of fallback transpilation, but throw an exception. Disable by
+  passing `--no-strict` to the CLI.
+
+## 0.1.0 - 2015-08-10
+### Added
+- Transpile `p` to `console.log`
+- Transpile class structures (constructors, instance variables etc.)
+- Transpile variable assignment (using let and const)
+- Transpile nil
+- Transpile symbols
+- Transpile if, unless
+- Transpile typed arrays
+- Transpile hash to object
+
+[Unreleased]: https://github.com/geppetto-apps/crow/compare/v0.2.0...HEAD
+[0.2.0]: https://github.com/geppetto-apps/crow/compare/v0.1.0...v0.2.0