update 1.1

git-svn-id: https://plugins.svn.wordpress.org/related-post/trunk@1049140 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/related-post/trunk@1049143 b8457f37-d9ea-0310-8a92-e5e31aec5664