Update readme file

git-svn-id: https://plugins.svn.wordpress.org/wr-contactform/trunk@1038709 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme file

git-svn-id: https://plugins.svn.wordpress.org/wr-contactform/trunk@1038714 b8457f37-d9ea-0310-8a92-e5e31aec5664