Update copyright.

setup-meraki-nets.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright (c) 2018  Joe Clarke <jclarke@cisco.com>
+# Copyright (c) 2018-2020  Joe Clarke <jclarke@cisco.com>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions