Add a changelog

Author: weiznich

CHANGELOG.md

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+# Change Log
+
+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)
+
+## [0.1.1] - 2022-10-19
+
+### Fixes
+
+* Fix prepared statement leak for the mysql backend implementation
+
+
+## 0.1.0 - 2022-09-27
+
+* Initial release
+
+[0.1.1]: : https://github.com/weiznich/diesel_async/compare/v0.1.0...v0.1.1