fix typo

index.html

@@ -78,7 +78,7 @@ <h2>About OpenTechSchool</h2>
   	<section id="archive">
   		<h2>Archive</h2>
   		<ul>
-        <li>Berlin, 2013/10/16 - <a href="presentations/2013-10-erlang-factory-berlin/">Introducing OpenTechSchool and Hackership </a> as given by <a href="http://www.erlang-factory.com/conference/Berlin2013/speakers/BenjaminKampmann">Benjamin Kampmann at Erlang Factory Lite Berlin</a></li>
+        <li>Berlin, 2013/10/16 - <a href="presentations/2013-10-erlang-factory-berlin/">Introducing OpenTechSchool and Hackership</a> as given by <a href="http://www.erlang-factory.com/conference/Berlin2013/speakers/BenjaminKampmann">Benjamin Kampmann at Erlang Factory Lite Berlin</a></li>
         <li>Cologne, 2013/10/15 - <a href="https://docs.google.com/presentation/d/1SCioo0L2zpcUobTZVOyts8unZcp8t1cmJycq1qFZJZg/edit">OTS Potpourri</a> as given by <a href="https://2013.de.pycon.org/schedule/sessions/8/">Robert Lehmann at PyConDE 2013</a></li>
         <li>Berlin, 2013/09/23 - <a href="https://docs.google.com/presentation/d/1sjhojB3BaCyb3ItF0t3z4YSZ9oxbSmcUKcNZVHeqqHU/edit">Inside OpenTechSchool - A worldwide community for free tech education</a> as given by <a href="http://socialmediaweek.org/berlin/events/?id=101151">Lorenzo Pilia and Duana Stanley at Social Media Week</a></li>
         <li>Berlin, 2013/05/10 - <a href="presentations/the-state-of-tech-education/">The state of Tech Education</a> as given by <a href="http://berlin.codemotionworld.com/talk-page/?talk_name=new-methods-in-tech-education">Amélie Anglade and Benjamin Kampmann at Codemotion Berlin</a></li>