Adds CHANGELOG.md.

Author: kzaher

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+---
+
+## [0.5](https://github.com/RxSwiftCommunity/RxDataSources/releases/tag/0.5)
+
+#### Features
+
+* Adds `self` data source as first parameter to all closures. (**breaking change**)
+* Adds `AnimationConfiguration` to enable configuring animation.
+* Replaces binding error handling logic with `UIBindingObserver`.