Update year in docs.

docs/conf.py

@@ -53,7 +53,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = 'diceware'
-copyright = '2015, 2016, Uli Fouquet'
+copyright = '2015-2017, Uli Fouquet'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the