Update CHANGES.md

Author: b-yogesh

chartlets.js/CHANGES.md

@@ -43,6 +43,7 @@
   - `Switch`
   - `Tabs`
   - `Slider`
+  - `Skeleton` (currently supported for Vega Charts)
 
 * Supporting `tooltip` property for interactive MUI components.
 

chartlets.py/CHANGES.md

@@ -23,6 +23,7 @@
   - `RadioGroup` and `Radio`
   - `Tabs`
   - `Slider`
+  - `Skeleton` (currently supported for Vega Charts)
 
 ## Version 0.0.29 (from 2024/11/26)