Update notice (#323)

diff --git a/NOTICE.txt b/NOTICE.txt
index ee979eb..6e4b2bd 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache OpenWhisk Catalog
-Copyright 2016-2019 The Apache Software Foundation
+Copyright 2016-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).