Add release date to changelog for v4.0.0

Jan5366x · Jan5366x · commit 26396861167b · 2025-12-19T20:05:40.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,4 +1,4 @@
-﻿## v4.0.0
+﻿## v4.0.0 - 19 Dez 2025
 * Switch to .Net 10.0
 * Switch to C# 14
 * Code refactoring
