Update copyright year to 2021

Author: gresrun

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2020 Greg Haines
+   Copyright 2021 Greg Haines
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

README.md

@@ -182,7 +182,7 @@ Boom! Ready to go!
 
 ## License
 
-Copyright 2020 Greg Haines
+Copyright 2021 Greg Haines
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.