Update what's new.md (#19)

dist/preview release/what's new.md

@@ -364,6 +364,7 @@
 - Fixed bug in `Mesh.IncreaseVertices` assuming null value if a property didn't exist. ([aWeirdo](https://github.com/aWeirdo))
 - Fix issue when taking a screenshot with multi-cameras using method `CreateScreenshotUsingRenderTarget` ([#9201](https://github.com/BabylonJS/Babylon.js/issues/9201)) ([gabrielheming](https://github.com/gabrielheming))
 - Fix inTangent in animationGroup ([dad72](https://github.com/dad72))
+- Fixed bug in `QuadraticErrorSimplification` not correctly optimizing mesh. ([aWeirdo](https://github.com/aWeirdo))
 
 ## Breaking changes
 
@@ -378,4 +379,4 @@
 - `smoothstep` in NME is now taking any type of parameters for its `value` input. If you use generated code from the NME ("Generate code" button), you may have to move the smoothstep output connection AFTER the input connections ([Popov72](https://github.com/Popov72))
 - `SoundTrack.RemoveSound` and `SoundTrack.AddSound` were renamed to `SoundTrack.removeSound` and `SoundTrack.addSound` ([Deltakosh](https://github.com/deltakosh))
 - `PolygonPoints.add` no longer filters out points that are close to the first point ([bghgary](https://github.com/bghgary))
-- `Material` created with matching names now have auto-incrementing IDs.
+- `Material` created with matching names now have auto-incrementing IDs.