Updated copyright

Author: alexanderdean

README.rst

@@ -40,7 +40,7 @@ Find out more
 Copyright and license
 #####################
 
-The Snowplow Python Tracker is copyright 2013 Snowplow Analytics Ltd.
+The Snowplow Python Tracker is copyright 2013-2014 Snowplow Analytics Ltd.
 
 Licensed under the `Apache License, Version 2.0`_ (the "License");
 you may not use this software except in compliance with the License.