update authors github link

Update account link for original author which has changed.
diff --git a/AUTHORS.rst b/AUTHORS.rst
index 1dc0411..6e017c9 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -8,7 +8,7 @@
 
 Previous Keepers of Crystals
 ````````````````````````````
-- Kenneth Reitz <me@kennethreitz.org> `@ken-reitz <https://github.com/ken-reitz>`_, reluctant Keeper of the Master Crystal.
+- Kenneth Reitz <me@kennethreitz.org> `@kennethreitz <https://github.com/kennethreitz>`_, reluctant Keeper of the Master Crystal.
 - Cory Benfield <cory@lukasa.co.uk> `@lukasa <https://github.com/lukasa>`_
 - Ian Cordasco <graffatcolmingov@gmail.com> `@sigmavirus24 <https://github.com/sigmavirus24>`_.