some readme fixes

git-svn-id: https://plugins.svn.wordpress.org/seedtag/trunk@1010713 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme

git-svn-id: https://plugins.svn.wordpress.org/seedtag/trunk@1010719 b8457f37-d9ea-0310-8a92-e5e31aec5664