update wn

dist/preview release/what's new.md

@@ -41,6 +41,7 @@
 - All NPM packages have `latest`and `preview` streams [#3055](https://github.com/BabylonJS/Babylon.js/issues/3055) ([RaananW](https://github.com/RaananW))
 - Added New Tools Tab in the inspector (env texture and screenshot tools so far) ([sebavan](http://www.github.com/sebavan))
 - Added `TextBlock.computeExpectedHeight`, added `TextWrapping.Ellipsis` as `TextBlock.wordWrapping` possible value ([adrientetar](https://github.com/adrientetar))
+- Moved to gulp 4, updated dependencies to latest ([RaananW](https://github.com/RaananW))
 
 ### Core Engine