Update what's new.md

dist/preview release/what's new.md

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       - Support for added to Blender Exporter ([Palmer-JC](https://github.com/Palmer-JC))
     - Float32Arrays can now directly be specified for vertex data attributes, `Mesh.updateVerticesDataDirectly` deprecated ([Palmer-JC](https://github.com/Palmer-JC))
     - Added panning axis to the ArcRotateCamera [PR](https://github.com/BabylonJS/Babylon.js/pull/913) ([mstdokumaci](https://github.com/mstdokumaci), [RaananW](https://github.com/RaananW))
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+    - Added `Tmp` class for internal use in order to improvement the memory management, [jerome](https://github.com/jbousquie))
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   - **Bug fixes**
     - Fixed a bug with spherical mapping ([deltakosh](https://github.com/deltakosh)) 
     - Fixed a bug with clone and createInstance which was forcing the recomputation of bounding boxes ([deltakosh](https://github.com/deltakosh))