Update what's new

dist/preview release/what's new.md

@@ -65,6 +65,7 @@
 
 - Added support for mesh instancing for improved performance when multiple nodes point to the same mesh ([bghgary](https://github.com/bghgary))
 - Create `TransformNode` objects instead of `Mesh` objects for glTF nodes without geometry ([bghgary](https://github.com/bghgary))
+- Added glTF JSON pointers to metadata of nodes, materials, and textures ([bghgary](https://github.com/bghgary))
 
 ### glTF Serializer