Update what's new.md

dist/preview release/what's new.md

@@ -38,6 +38,7 @@
 - Added `mesh.onMaterialChangedObservable` to notify when a new material is set ([deltakosh](https://github.com/deltakosh))
 - Improved the SPS perfs for dead or invisible solid particles ([jerome](https://github.com/jbousquie))  
 - Added `enableDepthSort` parameter to the SPS in order to sort the particles from the camera position ([jerome](https://github.com/jbousquie)) 
+- Added `pivot` property to the SPS solid particles ([jerome](https://github.com/jbousquie)) 
 
 ## Bug fixes
 - Fixed a bug with PBR on iOS ([sebavan](https://github.com/sebavan))