Add suggested CHANGELOG format

Based on recommendations from http://keepachangelog.com/

Author: Scott Cranfill

CHANGELOG.md

@@ -1,3 +1,17 @@
+All notable changes to this project will be documented in this file.
+We follow the [Semantic Versioning 2.0.0](http://semver.org/) format.
 
 
+## x.y.z - YYYY-MM-DD
 
+### Added
+- Lorem ipsum dolor sit amet
+
+### Deprecated
+- Nothing.
+
+### Removed
+- Nothing.
+
+### Fixed
+- Nothing.