Updated changelog for version 2.3.1

CHANGELOG.md

@@ -19,6 +19,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - The delete button for packages is now visible again. It was inadvertently missing in a previous update and has been rectified.
 
+- Fixed missing license properties (`od_conformance`, `ods_conformance`) in the [license configuration](./ckanext/odsh/resources/licenses.json).
+
 ## [2.3.0]
 
 ### Added