Update license statement

Signed-off-by: Joe Block <jpb@unixorn.net>

Author: unixorn

README.md

@@ -572,7 +572,7 @@ Writing good documentation and design docs is as important as writing code. The
 
 ## License
 
-This repository is copyright 2017-2021 Joseph Block under a [Attribution-NonCommercial-ShareAlike 4.0 International](#attribution-noncommercial-sharealike-40-international) license.
+This repository is copyright 2017-2023 Joseph Block under a [Attribution-NonCommercial-ShareAlike 4.0 International](#attribution-noncommercial-sharealike-40-international) license.
 
 ## Thanks