Merge pull request #420 from ruby-amqp/update-license-file

Update copyright year to 2026

Author: eglitobias

LICENSE

@@ -1,5 +1,5 @@
 Copyright (c) 2013-2016 GoCardless
-Copyright (c) 2016-2021 Hutch contributors
+Copyright (c) 2016-2026 Hutch contributors
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation