Bump what's new

dist/preview release/what's new.md

@@ -77,6 +77,7 @@
 - Added RGBD Texture tools [Sebavan](https://github.com/sebavan/)
 - Bumped Monaco Editor to 0.18.1 and improved TypeScript compilation pipeline in the playground ([sailro](http://www.github.com/sailro))
 - Added support for clickable errors in the playground ([sailro](http://www.github.com/sailro))
+- Added a color picker and previewer for BABYLON.ColorX invocations in the playground ([sailro](http://www.github.com/sailro))
 
 ### Meshes