Update CHANGELOG.md

Author: ramsessanchez

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Replace Javax annotations in favor of Jakarta annotations for Java code generation. [#2810](https://github.com/microsoft/kiota/issues/2810)
 - RequestExecuters call overload methods reducing code generation size for Java. [#3150](https://github.com/microsoft/kiota/issues/3150)  
 - Remove URISyntaxException from Java generated RequestExecutors and RequestGenerators. [#3149](https://github.com/microsoft/kiota/issues/3149)
+- Adds 'Generated' annotation to generated Enums and Classes for Java. [#3106](https://github.com/microsoft/kiota/issues/3106)
 
 ## [1.5.1] - 2023-08-08