Merge pull request #36 from unlimitedlabs/add_links

Adds a link to the mailing list in contributing.rst

docs/source/contributing.rst

@@ -13,7 +13,9 @@ our `open issues <https://github.com/unlimitedlabs/orchestra/issues>`_ and
 `pull requests <https://github.com/unlimitedlabs/orchestra/pulls>`_ to see if
 we're already aware of the problem. Also feel free to reach out to us on
 `gitter <https://gitter.im/unlimitedlabs/orchestra>`_ to answer questions at
-any time.
+any time, or `subscribe to the Orchestra mailing list
+<https://groups.google.com/forum/#!forum/orchestra-devel>`_ for longer
+conversations.
 
 If you've uncovered something new, please `create an issue
 <https://github.com/unlimitedlabs/orchestra/issues>`_ describing the problem.