readme.txt changes

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1031041 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/yuzo-related-post/trunk@1031043 b8457f37-d9ea-0310-8a92-e5e31aec5664