update the docs copyright years

Gauvain Pocentek · Gauvain Pocentek · commit e5246bffd17e · 2016-01-02T10:45:11.000+01:00
diff --git a/docs/conf.py b/docs/conf.py
@@ -61,7 +61,7 @@
 
 # General information about the project.
 project = 'python-gitlab'
-copyright = '2014, Gauvain Pocentek, Mika Mäenpää'
+copyright = '2013-2015, Gauvain Pocentek, Mika Mäenpää'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
