Updating Updated readme to reflect 3.9 "tested" version.


git-svn-id: https://plugins.svn.wordpress.org/contact-form-7-honeypot/trunk@895447 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added link to installation/setup video.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7-honeypot/trunk@895452 b8457f37-d9ea-0310-8a92-e5e31aec5664