Fix Changelog

Author: weiznich

CHANGELOG.md

@@ -4,7 +4,7 @@ All user visible changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/), as described
 for Rust libraries in [RFC #1105](https://github.com/rust-lang/rfcs/blob/master/text/1105-api-evolution.md)
 
-## [Unreleased
+## [Unreleased]
 
 ## [0.6.0] - 2025-07-02
 
@@ -94,4 +94,6 @@ in the pool should be checked if they are still valid
 [0.4.1]: https://github.com/weiznich/diesel_async/compare/v0.4.0...v0.4.1
 [0.5.0]: https://github.com/weiznich/diesel_async/compare/v0.4.0...v0.5.0
 [0.5.1]: https://github.com/weiznich/diesel_async/compare/v0.5.0...v0.5.1
-[Unreleased]: https://github.com/weiznich/diesel_async/compare/v0.5.1...main
+[0.5.2]: https://github.com/weiznich/diesel_async/compare/v0.5.1...v0.5.2
+[0.6.0]: https://github.com/weiznich/diesel_async/compare/v0.5.2...v0.6.0
+[Unreleased]: https://github.com/weiznich/diesel_async/compare/v0.5.0...main