Update copyright in README

Author: arraypad

README.md

@@ -133,7 +133,7 @@ However the following evil user gets to run arbitrary Perl code (in this case ca
 
 ## License
 
-Copyright 2019 Bobweb Ltd
+Copyright 2022 Bobweb Ltd
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: