Update docs copyright year.

carltongibson · carltongibson · commit 451d372715da · 2020-09-26T19:44:47.000+02:00
diff --git a/docs/conf.py b/docs/conf.py
@@ -41,7 +41,7 @@
 
 # General information about the project.
 project = u'django-filter'
-copyright = u'2019, Alex Gaynor, Carlton Gibson and others.'
+copyright = u'2020, Alex Gaynor, Carlton Gibson and others.'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
