update readme

git-svn-id: https://plugins.svn.wordpress.org/infinite-transporter/trunk@1043071 b8457f37-d9ea-0310-8a92-e5e31aec5664
markdown typo

git-svn-id: https://plugins.svn.wordpress.org/infinite-transporter/trunk@1043074 b8457f37-d9ea-0310-8a92-e5e31aec5664