Update what's new

dist/preview release/what's new.md

@@ -115,6 +115,7 @@
 - (Viewer) Viewer's declaration file automatically generated ([RaananW](https://github.com/RaananW))
 - New serialize and parse functions for effect layers (Highlight and Glow layers) ([julien-moreau](https://github.com/julien-moreau))
 - Added alphaCutOff support for StandardMaterial ([deltakosh](https://github.com/deltakosh))
+- Add support for sparse accessors to glTF 2.0 loader. ([bghgary](https://github.com/bghgary))
 
 ## Bug fixes