update CHANGES.md

Author: b-yogesh

chartlets.js/CHANGES.md

@@ -3,6 +3,8 @@
 * Add `multiple` property for `Select` component to enable the selection
   of multiple elements. The `default` mode is supported at the moment.
 
+* Callbacks will now only be invoked when there’s an actual change in state, reducing unnecessary processing and 
+  improving performance.
 
 ## Version 0.1.4 (from 2025/03/06)