update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/custom-fields-display/trunk@910823 b8457f37-d9ea-0310-8a92-e5e31aec5664
update author url

git-svn-id: https://plugins.svn.wordpress.org/custom-fields-display/trunk@910825 b8457f37-d9ea-0310-8a92-e5e31aec5664