readthedocs: update copyright years
@@ -21,7 +21,7 @@ sys.path.insert(0, os.path.abspath('.'))
# -- Project information -----------------------------------------------------
project = u'Contiki-NG'
-copyright = u'2018, Contiki-NG maintainers and contributors'
+copyright = u'2018-2022, Contiki-NG maintainers and contributors'
author = u'Contiki-NG maintainers and contributors'
# The short X.Y version
