Update example script tag

Author: vasturiano

example/ar-graph/index.html

@@ -6,7 +6,7 @@
   <script src="//unpkg.com/babel-standalone"></script>
 
   <script src="//unpkg.com/aframe"></script>
-  <script src="//unpkg.com/ar.js/aframe/build/aframe-ar.min.js"></script>
+  <script src="//unpkg.com/@ar-js-org/ar.js"></script>
 
   <script src="//unpkg.com/react-force-graph-ar"></script>
   <!--<script src="../../src/packages/react-force-graph-ar/dist/react-force-graph-ar.js"></script>-->