Update copyright year in the docs

Author: browniebroke

docs/conf.py

@@ -42,7 +42,7 @@
 
 # General information about the project.
 project = "Cookiecutter Django"
-copyright = "2013-2018, Daniel Roy Greenfeld".format(now.year)
+copyright = "2013-{}, Daniel Roy Greenfeld".format(now.year)
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the