Merge pull request #3627 from BabylonJS/jbousquie-patch-1

Update what's new.md

dist/preview release/what's new.md

@@ -40,6 +40,8 @@
 - Gulp process now supports multiple outputs when using webpack. ([RaananW](https://github.com/RaananW))
 - (Viewer) Scene Optimizer intergrated in viewer. ([RaananW](https://github.com/RaananW))
 - (Viewer) The viewer supports custom shaders in the configuration. ([RaananW](https://github.com/RaananW))
+- SPS internal storage of each solid particle rotation matrix ([jbousquie](https://github.com/jbousquie)) 
+
 
 ## Bug fixes
 - Texture extension detection in `Engine.CreateTexture` ([sebavan](https://github.com/sebavan))