chore(doc): Added my change to release doc

dist/preview release/what's new.md

@@ -99,6 +99,7 @@
 - Added support for KHR_materials_variants for glTF loader. ([MiiBond](https://github.com/MiiBond/))
 - Added support for KHR_materials_transmission for glTF loader. ([MiiBond](https://github.com/MiiBond/))
 - Improved progress handling in glTF loader. ([bghgary](https://github.com/bghgary))
+- Added missing "pluginExtension" parameter to SceneLoader.ImportAnimations. ([phenry20](https://github.com/phenry20))
 
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