add update per PR review

dist/preview release/what's new.md

@@ -60,6 +60,7 @@
 ### Meshes
 - Added new CreateTiledPlane and CreateTiledBox ([JohnK](https://github.com/BabylonJSGuide/))
 - Added absolute scaling and rotation getters ([haroldma](https://github.com/haroldma))
+- Added `BILLBOARDMODE_USE_POSITION` flag to billboards allowing use of camera positioning instead of orientation for mesh rotation ([delaneyj](https://github.com/delaneyj))
 
 ### Physics
 - Update Ammo.js library to support global collision contact callbacks ([MackeyK24](https://github.com/MackeyK24/))