Added fork me on github ribbon to demo page

shinglyu · shinglyu · commit 71ea9b8f16b0 · 2018-12-04T20:58:00.000+01:00
diff --git a/wasm/app/index.html b/wasm/app/index.html
@@ -6,5 +6,7 @@
   </head>
   <body>
     <script src="./bootstrap.js"></script>
+
+    <a href="https://github.com/RustPython/RustPython"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_green_007200.png" alt="Fork me on GitHub"></a>
   </body>
 </html>
