Files don't need individual license headers.

- All files are licensed by the LICENSE file at root.
- Updated the license to 2021.
- Have kept the license in LS_COLORS since its 3rd party.

tests/paged_list_test.py

@@ -1,8 +1,5 @@
 #!/usr/bin/env python3.8
 
-# Copyright (C) 2019 Andrew Hamilton. All rights reserved.
-# Licensed under the Artistic License 2.0.
-
 
 import pickle
 import tempfile