Update CHANGELOG.md

Author: nadar

core/CHANGELOG.md

@@ -3,7 +3,7 @@
 All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](https://semver.org/).
 In order to read more about upgrading and BC breaks have a look at the [UPGRADE Document](UPGRADE.md).
 
-## 2.3.1
+## 2.3.1 (7. February 2024) 
 
 + [#2187](https://github.com/luyadev/luya/pull/2187) Fixed parameter placeholders in translations (bg, hu, ro)