Update JSFiddle embed link in index.html to latest version

Author: nikoscham

index.html

@@ -74,7 +74,7 @@ <h2 id="gettingstarted"><a name="Getting Started"></a>Getting Started</h2>
       browser, without the need for any cloud services. The entire workflow is performed using JavaScript
       objects directly in the HTML file. Below is a live example demonstrating FEAScript in action (in case
       you are using a phone, please turn it to horizontal position to see the results):
-      <script async src="//jsfiddle.net/nikoscham/prhezsgv/8/embed/js,result/"></script>
+      <script async src="//jsfiddle.net/nikoscham/prhezsgv/12/embed/js,result/"></script>
     </p>
 
     <h2 id="features"><a name="Features"></a>Features</h2>