Updating readme

dist/preview release/what's new.md

@@ -8,6 +8,7 @@
 - New GUI 3D controls toolset. [Complete doc + demos](http://doc.babylonjs.com/how_to/gui3d) ([Deltakosh](https://github.com/deltakosh))
 - Added [Environment Texture Tools](https://doc.babylonjs.com/how_to/physically_based_rendering#creating-a-compressed-environment-texture) to reduce the size of the usual .DDS file ([sebavan](http://www.github.com/sebavan))
 - New GUI control: the [Grid](http://doc.babylonjs.com/how_to/gui#grid) ([Deltakosh](https://github.com/deltakosh))
+- New `serialize` and `Parse` functions to serialize and parse all procedural textures from the Procedural Textures Library ([julien-moreau](https://github.com/julien-moreau))
 
 ## Updates