update changelog [skip ci]

Author: tillkruss

CHANGELOG.md

@@ -75,7 +75,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Initial release
 
-[Unreleased]: https://github.com/cachewerk/heroku-php-extensions/compare/v2.0.0...HEAD
+[Unreleased]: https://github.com/cachewerk/heroku-php-extensions/compare/v2.0.1...HEAD
+[2.0.1]: https://github.com/cachewerk/heroku-php-extensions/compare/v2.0.0...v2.0.1
 [2.0.0]: https://github.com/cachewerk/heroku-php-extensions/compare/v1.2.6...v2.0.0
 [1.2.6]: https://github.com/cachewerk/heroku-php-extensions/compare/v1.2.5...v1.2.6
 [1.2.5]: https://github.com/cachewerk/heroku-php-extensions/compare/v1.2.4...v1.2.5