Bump copyright year

oschwald · oschwald · commit ccdc64f5056c · 2021-11-17T13:55:45.000-08:00
diff --git a/README.md b/README.md
@@ -532,6 +532,6 @@ The GeoIP2 Java API uses [Semantic Versioning](https://semver.org/).
 
 ## Copyright and License ##
 
-This software is Copyright (c) 2013-2020 by MaxMind, Inc.
+This software is Copyright (c) 2013-2021 by MaxMind, Inc.
 
 This is free software, licensed under the Apache License, Version 2.0.
