Fix link to json-schema GitHub

Author: awwright

index.html

@@ -60,7 +60,7 @@ <h2>More</h2>
 	</ul>
 	<p>Questions?  Feeling helpful?  Get involved on:
 	<ul>
-		<li>the <a href="http://github.com/json-schema/json-schema">GitHub repo</a></li>
+		<li>the <a href="http://github.com/json-schema-org/json-schema-spec">GitHub repo</a></li>
 		<li>the <a href="https://groups.google.com/forum/#!forum/json-schema">Google Group</a></li>
 	</ul>
 </div>