bumped WordPress 4.0 compatibility

git-svn-id: https://plugins.svn.wordpress.org/custom-content-by-country/trunk@979236 b8457f37-d9ea-0310-8a92-e5e31aec5664
changed readmet

git-svn-id: https://plugins.svn.wordpress.org/custom-content-by-country/trunk@979238 b8457f37-d9ea-0310-8a92-e5e31aec5664