update readme

git-svn-id: https://plugins.svn.wordpress.org/sockem-spambots/trunk@793738 b8457f37-d9ea-0310-8a92-e5e31aec5664
release 0.7.0

git-svn-id: https://plugins.svn.wordpress.org/sockem-spambots/trunk@794209 b8457f37-d9ea-0310-8a92-e5e31aec5664