Merge pull request #804 from rbozan/patch-1

Fixed link

dist/preview release/what's new.md

@@ -1,7 +1,7 @@
 - 2.3.0:
   - **Major updates**
     - Point lights shadow mapping. [Demo here](http://www.babylonjs-playground.com/#LYCSQ#12) ([deltakosh](https://github.com/deltakosh))
-    - Introducing [Materials Library](https://github.com/BabylonJS/Babylon.js/materialsLibrary) ([deltakosh](https://github.com/deltakosh))
+    - Introducing [Materials Library](https://github.com/BabylonJS/Babylon.js/tree/master/materialsLibrary) ([deltakosh](https://github.com/deltakosh))
     - New cache mecanism for StandardMaterial ([deltakosh](https://github.com/deltakosh))
     - New Solid Particle System ([jerome](https://github.com/jbousquie))
     - New `StandardMaterial.lightmapTexture` which can be controlled with `StandardMaterial.useLightmapAsShadowMap` ([deltakosh](https://github.com/deltakosh))