Update CHANGELOG

Author: derXear

CHANGELOG.md

@@ -6,9 +6,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [0.9.1] - 2019-09-09
+### Fixed 
+- Fix locking DefaultDynamoCacheWriter by [@derXear](https://github.com/derXear)
+
 ## [0.9.0] - 2019-09-06
 ### Added 
 - initial code base by [@derXear](https://github.com/derXear)
 
-[Unreleased]: https://github.com/bad-opensource/spring-cache-dynamodb/compare/v0.9.0...HEAD
+[Unreleased]: https://github.com/bad-opensource/spring-cache-dynamodb/compare/v0.9.1...HEAD
+[0.9.1]: https://github.com/bad-opensource/spring-cache-dynamodb/releases/tag/v0.9.0...v0.9.1
 [0.9.0]: https://github.com/bad-opensource/spring-cache-dynamodb/releases/tag/v0.9.0