updating readme.txt

git-svn-id: https://plugins.svn.wordpress.org/bbpress-auto-delete-spam-replies/trunk@797790 b8457f37-d9ea-0310-8a92-e5e31aec5664
updating readme!

git-svn-id: https://plugins.svn.wordpress.org/bbpress-auto-delete-spam-replies/trunk@797791 b8457f37-d9ea-0310-8a92-e5e31aec5664