Update copyright year.
diff --git a/NOTICE b/NOTICE
index a88b8d4..c899008 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
 Apache Twill
-Copyright 2013-2016 The Apache Software Foundation
+Copyright 2013-2017 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).