Add a link to commit mail mailing list

Author: kou

index.html

@@ -48,6 +48,8 @@ <h3>Resources</h3>
       <dd><a href="https://github.com/ruby-gettext/gettext">GitHub</a></dd>
       <dt>Gem</dt>
       <dd><a href="https://rubygems.org/gems/gettext">RubyGems.org</a></dd>
+      <dt>Commit mails</dt>
+      <dd><a href="https://groups.google.com/d/forum/ruby-gettext-commit">ruby-gettext-commit@googlegroups.com</a></dd>
     </dl>
   </div>