Update what's new

dist/preview release/what's new.md

@@ -39,7 +39,7 @@
 - Added support for KHR_texture_transform ([bghgary](http://www.github.com/bghgary))
 - Added `onNodeLODsLoadedObservable` and `onMaterialLODsLoadedObservable` to MSFT_lod loader extension ([bghgary](http://www.github.com/bghgary))
 - Added glTF loader settings to the GLTF tab in the debug layer ([bghgary](http://www.github.com/bghgary))
-- Added support for debug logging ([bghgary](http://www.github.com/bghgary))
+- Added debug logging and performance counters ([bghgary](http://www.github.com/bghgary))
 
 ### Viewer