Updated readme to reflect compatibility with WordPress v3.9

git-svn-id: https://plugins.svn.wordpress.org/cf-wod-posts/trunk@895083 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated readme.txt to reflect compatibility with WordPress v3.9

git-svn-id: https://plugins.svn.wordpress.org/cf-wod-posts/trunk@895085 b8457f37-d9ea-0310-8a92-e5e31aec5664