Update changelog for 1.2.0

Author: turtle0x1

CHANGELOG.md

@@ -4,6 +4,10 @@ All Notable changes to `php-lxd` will be documented in this file.
 
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+# [1.2.0]
+## Fixed
+    Derpciation warnings caused by PHP 8.4    
+
 # [1.1.0]
 ## Changed
     Require PHP >= 7.2.5 and support PHP8 in composer.json