Fix typo in changelog

Author: Amanieu

CHANGELOG.md

@@ -42,7 +42,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Initial release
 
 [Unreleased]: https://github.com/Amanieu/hashbrown/compare/v0.1.5...HEAD
-[v0.1.4]: https://github.com/Amanieu/hashbrown/compare/v0.1.4...v0.1.5
+[v0.1.5]: https://github.com/Amanieu/hashbrown/compare/v0.1.4...v0.1.5
 [v0.1.4]: https://github.com/Amanieu/hashbrown/compare/v0.1.3...v0.1.4
 [v0.1.3]: https://github.com/Amanieu/hashbrown/compare/v0.1.2...v0.1.3
 [v0.1.2]: https://github.com/Amanieu/hashbrown/compare/v0.1.1...v0.1.2