added Call to Action desc

git-svn-id: https://plugins.svn.wordpress.org/easy-notify-lite/trunk@997974 b8457f37-d9ea-0310-8a92-e5e31aec5664
re-commit because description not changed after update

git-svn-id: https://plugins.svn.wordpress.org/easy-notify-lite/trunk@997976 b8457f37-d9ea-0310-8a92-e5e31aec5664