update whatsnu

dist/preview release/what's new.md

@@ -51,6 +51,7 @@
 - Support for model drag and drop onto the canvas ([RaananW](https://github.com/RaananW))
 - New lab feature - global light rotation [#4347](https://github.com/BabylonJS/Babylon.js/issues/4347) ([RaananW](https://github.com/RaananW))
 - New NPM package - babylonjs-viewer-assets, to separate the binary assets and the code of the viewer ([RaananW](https://github.com/RaananW))
+- A new HD-Toggler button allows setting a better hardware scaling rate ([RaananW](https://github.com/RaananW))
 
 ### Documentation