Update what's new.md

what's new.md

@@ -174,7 +174,6 @@
 
 ## Bug fixes
 
-- Fixed FileLoader's loading of a skybox, & added a parsed value for whether to create with PBR or STDMaterial ([Palmer-JC](https://github.com/Palmer-JC))
 - VR experience helper will now fire pointer events even when no mesh is currently hit ([TrevorDev](https://github.com/TrevorDev))
 - RawTexture.CreateAlphaTexture no longer fails to create a usable texture ([TrevorDev](https://github.com/TrevorDev))
 - SceneSerializer.SerializeMesh now serializes all materials kinds (not only StandardMaterial) ([julien-moreau](https://github.com/julien-moreau))