Merge pull request rubyburgers#5 from phoet/master

add hamburg to the list of ruby burger locations

Author: ys

index.html

@@ -21,4 +21,5 @@ <h2>Current Meals</h2>
   <a class="extra" href="http://www.meetup.com/ruby_burgers-rb/">Rubyburgers - Brussels</a>
   <a class="extra" href="http://ruby_boulets.eventbrite.com/">Rubyboulets - Liège</a>
   <a class="extra" href="http://www.meetup.com/ruby_burgers_austin-rb/">Rubyburgers - Austin, TX</a>
+  <a class="extra" href="http://hamburg.onruby.de/events/ruby-burgers-oktober" title="Rubyburgers - Hamburg">Rubyburgers - Hamburg, Germany</a>
 </div>