Update comparison links

Author: tacovandenbroek

CHANGELOG.md

@@ -43,7 +43,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 - First release based on the PSR-15 draft.
 
-[Unreleased]: https://github.com/procurios/middleware-dispatcher/compare/1.0.1...HEAD
+[Unreleased]: https://github.com/procurios/middleware-dispatcher/compare/2.0.0...HEAD
+[2.0.0]: https://github.com/procurios/middleware-dispatcher/compare/1.0.1...2.0.0
 [1.0.1]: https://github.com/procurios/middleware-dispatcher/compare/1.0.0...1.0.1
 [1.0.0]: https://github.com/procurios/middleware-dispatcher/compare/0.1...1.0.0
 [0.1]: https://github.com/procurios/middleware-dispatcher/commits/0.1