Add gnarvaja to AUTHORS

Author: richleland

AUTHORS.rst

@@ -13,5 +13,6 @@ Patches and suggestions
 - Mohammad Hossain `@rajumsys <https://github.com/rajumsys>`_
 - Zdeněk Softič `@btx <https://github.com/btx>`_
 - Simeon Visser `@svisser <https://github.com/svisser>`_
+- `@gnarvaja <https://github.com/gnarvaja>`_
 - `@puttu <https://github.com/puttu>`_
 - ADD YOURSELF HERE (and link to your github page)