Update CHANGELOG.MD

CHANGELOG.MD

@@ -12,6 +12,8 @@ All notable changes to this project will be documented in this file.
   - Add NEW Unprivileged Install Script
 - **Mariadb LXC**
   - Add NEW Unprivileged Install Script
+- **MQTT LXC**
+  - Add NEW Unprivileged Install Script
 
 ## 2022-02-20