Fix readme

git-svn-id: https://plugins.svn.wordpress.org/twitter-hashtag-blaster/trunk@864899 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix readme some more

git-svn-id: https://plugins.svn.wordpress.org/twitter-hashtag-blaster/trunk@864901 b8457f37-d9ea-0310-8a92-e5e31aec5664