compability check with WP 4

git-svn-id: https://plugins.svn.wordpress.org/my-christmas-calendar/trunk@1024888 b8457f37-d9ea-0310-8a92-e5e31aec5664
add new subversion to plugin head

git-svn-id: https://plugins.svn.wordpress.org/my-christmas-calendar/trunk@1024889 b8457f37-d9ea-0310-8a92-e5e31aec5664