copyright year

TODO: should really dynamically obtain that from 'cayenne.build.date'

(cherry picked from commit 6c172af728fb25f68ea4e3a84807d05a06fef2b5)

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/branches/STABLE-3.0@1509791 13f79535-47bb-0310-9956-ffa450edef68