Update what's new.md

dist/preview release/what's new.md

@@ -13,3 +13,4 @@
   - **Bug fixes**
     - Fixed bug with ArcRotateCamera.setTarget ([deltakosh](https://github.com/deltakosh))
   - **Breaking changes**
+    - `VertexData.CreateLines()` removed as `MeshBuilder.CreateLines()` now calls `MeshBuilder.CreateLineSystem()`