add wiki link

Author: jh0ker

website/templates/website/index.html

@@ -46,6 +46,7 @@ <h2 class="subtitle">We have made you a wrapper you can't refuse</h2>
                     <li><a href="https://telegram.me/pythontelegrambotgroup">Community</a></li>
                     <li><a href="https://github.com/python-telegram-bot/python-telegram-bot">Development</a></li>
                     <li><a href="http://pythonhosted.org/python-telegram-bot/">Documentation</a></li>
+                    <li><a href="https://github.com/python-telegram-bot/python-telegram-bot/wiki">Wiki</a></li>
                     <li><a href="https://pypi.python.org/pypi/python-telegram-bot">Download</a></li>
                 </ul>
             </nav>