update changelog

Author: mustafasoylu

CHANGELOG.md

@@ -4,9 +4,10 @@ Here we provide notes that summarize the most important changes in each released
 
 Please consult the changelog to inform yourself about breaking changes and security issues.
 
-## [v0.2.1](https://github.com/Materials-Data-Science-and-Informatics/somesy/tree/v0.2.0) <small>(2023-11-29)</small> { id="0.2.1" }
+## [v0.2.1](https://github.com/Materials-Data-Science-and-Informatics/somesy/tree/v0.2.1) <small>(2023-11-29)</small> { id="0.2.1" }
 
 * **internal:** updated linters and dependencies
+* **internal:** pin codemetapy version to 2.5.2 to avoid breaking changes
 * fix bug caused by missing `config` section
 
 ## [v0.2.0](https://github.com/Materials-Data-Science-and-Informatics/somesy/tree/v0.2.0) <small>(2023-11-29)</small> { id="0.2.0" }