Prepare for 0.5.1 release

Author: colinodell

CHANGELOG.md

@@ -3,6 +3,8 @@ All notable changes to this project will be documented in this file.
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
 ## [Unreleased][unreleased]
+
+## [0.5.1] - 2014-12-27
 ### Fixed
  - Fixed infinite loop and link-in-link-in-image parsing (#37)
 
@@ -95,7 +97,8 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 ### Added
  - Initial commit (compatible with jgm/stmd:spec.txt @ 0275f34)
 
-[unreleased]: https://github.com/thephpleague/commonmark/compare/0.5.0...HEAD
+[unreleased]: https://github.com/thephpleague/commonmark/compare/0.5.1...HEAD
+[0.5.1]: https://github.com/thephpleague/commonmark/compare/0.5.0...0.5.1
 [0.5.0]: https://github.com/thephpleague/commonmark/compare/0.4.0...0.5.0
 [0.4.0]: https://github.com/thephpleague/commonmark/compare/0.3.0...0.4.0
 [0.3.0]: https://github.com/thephpleague/commonmark/compare/0.2.1...0.3.0