Add what's new note for KHR_materials_translucency loader

dist/preview release/what's new.md

@@ -154,6 +154,7 @@
 - Added the `loadAllMaterials` property to the gLTF loader to load materials even if not used by any mesh ([Popov72](https://github.com/Popov72))
 - Added transmission prerender pass when using KHR_materials_transmission ([MiiBond](https://github.com/MiiBond/))
 - Fixed a bug when loading glTF with interleaved animation data. ([bghgary](https://github.com/bghgary))
+- Added support for KHR_materials_translucency for glTF loader. ([MiiBond](https://github.com/MiiBond/))
 
 ### Serializers