Update what's new.md (#20)

dist/preview release/what's new.md

@@ -164,6 +164,7 @@
 - Added support for glTF Skins to glTF serializer ([Drigax](https://github.com/Drigax))
 - Added support for glTF Morph Target serialization ([Drigax](https://github.com/Drigax))
 - Fixed several bugs in stlSerializer ([aWeirdo](https://github.com/aWeirdo))
+- Added param `doNotBakeTransform` to `stlSerializer.CreateSTL` ([aWeirdo](https://github.com/aWeirdo))
 
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