Add changelog date

Author: Jyyjy

CHANGELOG.md

@@ -1,8 +1,26 @@
+<!--
+    Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+-->
 Changelog
 =========
 
 
-Apache Flagon UserALE.js 2.4.0 (2023-XX-XX)
+Apache Flagon UserALE.js 2.4.0 (2024-03-21)
 -------------------------------
 * Release Notes - Flagon - Version UserALE.js 2.4.0
 * [Closed Tickets](https://github.com/apache/incubator-flagon-useralejs/projects/9)