Update index.html

Author: SilentCoderHere

ping-pong/index.html

@@ -9,6 +9,6 @@
   <div id="container">
     <canvas id="pongCanvas" width="800" height="500"></canvas>
   </div>
-  <script src="game.js"></script>
+  <script src="script.js"></script>
 </body>
 </html>