Fix format in CHANGELOG.rst (#44)

Author: roaldnefs

CHANGELOG.rst

@@ -35,8 +35,8 @@ This project adheres to `Semantic Versioning <http://semver.org/>`_.
 * Initial public release, versions 0.1.0 and 0.2.0 have been skipped to miminize interference when publishing to PyPi
 
 
-.. 0.3.0: https://github.com/benkonrath/transip-api/commit/73925ff
-.. 0.4.0: https://github.com/benkonrath/transip-api/compare/0.3.0...0.4.0
-.. 0.4.1: https://github.com/benkonrath/transip-api/compare/0.4.0...0.4.1
-.. 1.0.0: https://github.com/benkonrath/transip-api/compare/0.4.1...v1.0.0
-.. 1.0.1: https://github.com/benkonrath/transip-api/compare/v1.0.0...v1.0.1
+.. _0.3.0: https://github.com/benkonrath/transip-api/commit/73925ff
+.. _0.4.0: https://github.com/benkonrath/transip-api/compare/0.3.0...0.4.0
+.. _0.4.1: https://github.com/benkonrath/transip-api/compare/0.4.0...0.4.1
+.. _1.0.0: https://github.com/benkonrath/transip-api/compare/0.4.1...v1.0.0
+.. _1.0.1: https://github.com/benkonrath/transip-api/compare/v1.0.0...v1.0.1