update copyright date

mojavelinux · mojavelinux · commit ea26c922ebbd · 2021-03-28T18:04:51.000-06:00
diff --git a/README.adoc b/README.adoc
@@ -589,5 +589,5 @@ As such, use of the software is granted under the terms of the https://www.mozil
 
 === Branding and Design
 
-Copyright (C) {url-couchbase}[Couchbase] 2018-2019.
+Copyright (C) {url-couchbase}[Couchbase] 2018-2021.
 All rights reserved.
