Changes CHANGELOG file to include latest changes.

CHANGELOG.md

@@ -0,0 +1,16 @@
+# Change Log
+All notable changes to the `flysystem-github` project will be documented in this 
+file. This project adheres to [Semantic Versioning](http://semver.org/).
+
+## 0.1.0 - 2015-07-18 - Read functionality
+### Added
+Read functionality and Github API authentication have been implemented.
+
+## 0.0.0 - 2015-05-11 - Project Setup
+### Added
+Set up project basics like .gitignore file, PHPUnit Configuration file, 
+Contributing guidelines, Composer file stating dependencies, MIT License, README 
+file and this CHANGELOG file.
+
+[unreleased]: https://github.com/potherca/flystystem-github/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/potherca/flystystem-github/compare/v0.0.0...v0.1.0