Update screenshots paths

Author: Olivier Giniaux

README.md

@@ -4,9 +4,9 @@ A Grid Shader for Unity !
 It can scale infinitely (log10 scaling). Main lines will show a one to one grid for the current scale, while secondary lines show up secondary units.       
 It performs much better than relying on GL lines to draw a grid, has more customization possibilities and works in a lot more situations.    
 
-![Plane](https://raw.githubusercontent.com/ogxd/grid-shader-unity/master/Demo/plane.png)
-![Cube](https://raw.githubusercontent.com/ogxd/grid-shader-unity/master/Demo/cube.png)
-![Thickness](https://raw.githubusercontent.com/ogxd/grid-shader-unity/master/Demo/thickness.png)
+![Plane](https://raw.githubusercontent.com/ogxd/grid-shader-unity/master/Demo/plane.gif)
+![Cube](https://raw.githubusercontent.com/ogxd/grid-shader-unity/master/Demo/cube.gif)
+![Thickness](https://raw.githubusercontent.com/ogxd/grid-shader-unity/master/Demo/thickness.gif)
 
 ## How To
 Download the .unitypackage in the Release tab (or checkout and copy the Assets/Plugins/GridShader folder to your Assets folder)