refacto - upgrade licences : update CHANGELOG

Author: dedece35

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- [#5](https://github.com/green-code-initiative/ecoCode-python/pull/5) Upgrade licence system and licence headers of Java files
+
 ### Deleted
 
 ## [1.4.0] - 2023-08-08