Update jsfiddle with working cdn

RawGit has shut down, and because of this the link in our readme no longer works. This PR migrates the jsfiddle example to use jsDelivr instead.

README.md

@@ -64,7 +64,7 @@ function animate() {
 }
 ```
 
-If everything went well you should see [this](https://jsfiddle.net/f2Lommf5/).
+If everything went well you should see [this](https://jsfiddle.net/3hkq1L4s/).
 
 ### Change log ###