Add @rowillia to AUTHORS; update changelog

Author: sloria

AUTHORS.rst

@@ -84,3 +84,4 @@ Contributors (chronological)
 - Vlad Frolov `@frol <https://github.com/frol>`_
 - Erling Børresen `@erlingbo <https://github.com/erlingbo>`_
 - Jérôme Lafréchoux  `@lafrech <https://github.com/lafrech>`_
+- Roy Williams `@rowillia <https://github.com/rowillia>`_

CHANGELOG.rst

@@ -17,6 +17,10 @@ Bug fixes:
 
 - Includes bug fixes from release 2.13.5.
 
+Support:
+
+- Add benchmark script. Thanks :user:`rowillia`.
+
 3.0.0b2 (2017-03-19)
 ++++++++++++++++++++