Update README.md

Author: cheton

README.md

@@ -5,7 +5,7 @@ A browser-ready tree library that can efficiently display a large tree with smoo
 
 View [demo](http://cheton.github.io/infinite-tree) at http://cheton.github.io/infinite-tree.
 
-[![IMAGE ALT TEXT](https://github.com/cheton/infinite-tree/blob/master/media/infinite-tree.gif)](http://cheton.github.io/infinite-tree)
+[![IMAGE ALT TEXT](https://raw.githubusercontent.com/cheton/infinite-tree/master/media/infinite-tree.gif)](http://cheton.github.io/infinite-tree)
 
 #### The project is under heavy development and a lot of things are changing. Stay tuned for more information later.