What's new update

dist/preview release/what's new.md

@@ -94,6 +94,7 @@
 - Allow parenthesis usage in `#if` expressions in shader code ([Popov72](https://github.com/Popov72))
 - Added to `StandardMaterial` RGBD ReflectionTexture, RefractionTexture and LightmapTexture support. ([MackeyK24](https://github.com/MackeyK24))
 - Allow using the single comment syntax `// comment` in a `#if` construct in shader code ([Popov72](https://github.com/Popov72))
+- Added the possibility to update the shader code before being compiled ([Popov72](https://github.com/Popov72))
 
 ### WebXR