fixes in readme

git-svn-id: https://plugins.svn.wordpress.org/music-seller/trunk@985269 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version 2.7, css fixes

git-svn-id: https://plugins.svn.wordpress.org/music-seller/trunk@985275 b8457f37-d9ea-0310-8a92-e5e31aec5664