Bump version to 0.3.1

Author: exodrifter

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+
+## [0.3.1]
+
 ### Fixed
 * Added a missing DLL `Microsoft.Scripting.Metadata` that is required
   to build
@@ -36,7 +39,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 Initial support for Python in Unity3D with IronPython 2.6.2.
 
-[Unreleased]: https://github.com/exodrifter/unity-python/compare/0.3.0...HEAD
+[Unreleased]: https://github.com/exodrifter/unity-python/compare/0.3.1...HEAD
+[0.3.1]: https://github.com/exodrifter/unity-python/compare/0.3.0...0.3.1
 [0.3.0]: https://github.com/exodrifter/unity-python/compare/0.2.0...0.3.0
 [0.2.0]: https://github.com/exodrifter/unity-python/compare/0.1.0...0.2.0
 [0.1.0]: https://github.com/exodrifter/unity-python/compare/0.0.0...0.1.0