edited compatible version

git-svn-id: https://plugins.svn.wordpress.org/formget-contact-form/trunk@1035783 b8457f37-d9ea-0310-8a92-e5e31aec5664
edited 5.0 readme.txt

git-svn-id: https://plugins.svn.wordpress.org/formget-contact-form/trunk@1035785 b8457f37-d9ea-0310-8a92-e5e31aec5664