Added link to Elixir GtkSourceView

Author: Steffen Bauer

_includes/important-links.html

@@ -25,7 +25,8 @@ <h3 class="widget-title">Code editor support</h3>
     <li><a class="spec" href="https://github.com/elixir-lang/emacs-elixir" target="_blank">Emacs Mode</a></li>
     <li><a class="spec" href="https://github.com/elixir-lang/elixir-tmbundle" target="_blank">Textmate Bundle</a></li>
     <li><a class="spec" href="https://github.com/elixir-lang/vim-elixir" target="_blank">Vim Elixir</a></li>
+    <li><a class="spec" href="https://github.com/SteffenBauer/elixir-gtksourceview" target="_blank">GtkSourceView (gedit)</a></li>
   </ul>
 </div>
 
-{% include sponsors.html %}
+{% include sponsors.html %}