Update readme.md

readme.md

@@ -96,21 +96,21 @@ window.addEventListener('resize', function(){
 ```
 ## Preview release
 
-Preview version of **3.2** can be found [here](https://github.com/BabylonJS/Babylon.js/tree/master/dist/preview%20release).
+Preview version of **3.3** can be found [here](https://github.com/BabylonJS/Babylon.js/tree/master/dist/preview%20release).
 If you want to contribute, please read our [contribution guidelines](https://github.com/BabylonJS/Babylon.js/blob/master/contributing.md) first.
 
 ## Documentation
-- [Documentation](http://doc.babylonjs.com)
-- [Samples](https://github.com/BabylonJS/Samples)
-- [Video overview (1 hour) of BabylonJS features](http://www.youtube.com/watch?v=z80TYMqsdEM)
-- [Complete course (8 hours)](http://www.microsoftvirtualacademy.com/training-courses/introduction-to-webgl-3d-with-html5-and-babylon-js)
+- [Documentation](https://doc.babylonjs.com)
+- [Examples](https://doc.babylonjs.com/examples)
 
 ## Useful links
 
- - Official web site: [www.babylonjs.com](http://www.babylonjs.com/)
- - Online [sandbox](http://www.babylonjs.com/sandbox) where you can test your .babylon scenes with a simple drag'n'drop
- - Online [shader creation tool](http://www.babylonjs.com/cyos/) where you can learn how to create GLSL shaders
+ - Official web site: [www.babylonjs.com](http://wwws.babylonjs.com/)
+ - Online [playground](https://playground.babylonjs.com/) to learn by experimentating
+ - Online [sandbox](https://www.babylonjs.com/sandbox) where you can test your .babylon and glTF scenes with a simple drag'n'drop
+ - Online [shader creation tool](https://www.babylonjs.com/cyos/) where you can learn how to create GLSL shaders
  - 3DS Max [exporter](https://github.com/BabylonJS/Exporters/tree/master/3ds%20Max) can be used to generate a .babylon file from 3DS Max
+ - Maya [exporter](https://github.com/BabylonJS/Exporters/tree/master/Maya) can be used to generate a .babylon file from 3DS Max
  - Blender [exporter](https://github.com/BabylonJS/Exporters/tree/master/Blender) can be used to generate a .babylon file from Blender 3d
  - Unity 5 [exporter](https://github.com/BabylonJS/Exporters/tree/master/Unity%205) can be used to export your geometries from Unity 5 scene editor(animations are supported)