Update CHANGELOG.md

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to [ChaiLove](https://github.com/RobLoach/ChaiLove) will be
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## 0.13.0 - Unreleased
+### Added
+- Documentation
+
+### Fixed
+- Renamed `mousemove()` callback to `mousemoved()`
+
 ## 0.12.0 - 2017-12-13
 ### Added
 - `SoundData.getVolume()`