Updated what's new

what's new.md

@@ -81,6 +81,7 @@
 - Fixed a bug with impostor jitter when in VR. ([RaananW](https://github.com/RaananW))
 - Fixed a bug with GUI Slider not working correctly when rotated ([adam](https://github.com/abow))
 - Fixed IE11 "spacebar" bug with GUI InputText ([adam](https://github.com/abow))
+- Fixed a bug where instanced meshes did not work with physics helper effects ([bobalazek](https://github.com/bobalazek))
 
 ## Breaking changes