LICENSE: Update copyright date

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

LICENSE

@@ -7,7 +7,7 @@ our release process to generate text file content and are not part of any
 generated binary.
 -----------------------------------------------------------------------------
 
-Copyright (c) 2015-2018 Red Hat, Inc.
+Copyright (c) 2015-2020 Red Hat, Inc.
 
 All rights reserved.