Added missing code for RSS URL

git-svn-id: https://plugins.svn.wordpress.org/link-library/trunk@933391 b8457f37-d9ea-0310-8a92-e5e31aec5664
Missing slash

git-svn-id: https://plugins.svn.wordpress.org/link-library/trunk@933392 b8457f37-d9ea-0310-8a92-e5e31aec5664