Update what's new.md

dist/preview release/what's new.md

@@ -8,7 +8,8 @@
     - Fixed bug with texture coordinates matrices ([deltakosh](https://github.com/deltakosh))
     - Fixed Sphere texture coordinates generation ([deltakosh](https://github.com/deltakosh))
     - Fixed bug with `Mesh.attachToBone` when bone's matrix has a negative determinant ([deltakosh](https://github.com/deltakosh))
-    - Fixed a possible but with the active camera while taking a screenshot ([RaananW](https://github.com/RaananW))
+    - Fixed a possible but with the active camera while taking a screenshot [PR](https://github.com/BabylonJS/Babylon.js/pull/701) ([RaananW](https://github.com/RaananW))
+    - Fixed a bug with worker-collisions and instances [PR](https://github.com/BabylonJS/Babylon.js/pull/705) ([RaananW](https://github.com/RaananW))
   - **Breaking changes**
     - `Mesh.CreateCylinder()` old signature (without _subdivisions_ parameter) deprecated ([jerome](https://github.com/jbousquie))