Update what's new with glTF 2.0 loader

dist/preview release/what's new.md

@@ -48,6 +48,7 @@
 - Added `VertexBuffer.TangentKind` to specify tangents in place of shader-calculated tangents ([dewadswo](https://github.com/dewadswo), [bghgary](https://github.com/bghgary))
 - Added `material.twoSidedLighting` to PBRMaterial and StandardMaterial to enable flipping normals when backfaceCulling is false ([BeardedGnome](https://github.com/BeardedGnome), [bghgary](https://github.com/bghgary))
 - Added a [HTML page](https://github.com/BabylonJS/Babylon.js/blob/master/Tools/Gulp/profiling.html) with embedded directions to improve the custom build process. ([jcpalmer](https://github.com/Palmer-JC))
+- Added glTF 2.0 loader with versioning support ([bghgary](https://github.com/bghgary), thanks to [BeardedGnome](https://github.com/BeardedGnome) for animation updates)
  
 ### Bug fixes
 - Fixed a bug with spotlight direction ([deltakosh](https://github.com/deltakosh))