Updating readme

dist/preview release/what's new.md

@@ -21,6 +21,7 @@
  - Text2D super sampling to enhance quality in World Space Canvas
  - World Space Canvas is now rendering in an adaptive way for its resolution to fit the on screen projected one to achieve a good rendering quality
  - Transparent Primitives are now drawn with Instanced Array when supported
+- WebVR Camera was updated to be conform with the current specs. ([RaananW](https://github.com/RaananW)) 
 
 ### Exporters