Stop referencing Bintray

Author: Henri Tremblay

website/site/content/download.html

@@ -40,7 +40,7 @@
     </li>
 </ul>
 
-<p>Older versions can be found <a href="https://bintray.com/easymock/distributions/objenesis" target="_blank">here</a></p>
+<p>Older versions can be found <a href="https://repo.maven.apache.org/maven2/org/objenesis" target="_blank">here</a></p>
 
 </body>
 </html>