Fix copyright year

Author: thegridman

java/coherence-utils/src/assembly/image-assembly.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <!--
-  ~ Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+  ~ Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
   ~ Licensed under the Universal Permissive License v 1.0 as shown at
   ~ http://oss.oracle.com/licenses/upl.
   -->