fix links in readme


git-svn-id: https://plugins.svn.wordpress.org/g-crossposting/trunk@912914 b8457f37-d9ea-0310-8a92-e5e31aec5664
remove bitcoin link and just have plain address shown


git-svn-id: https://plugins.svn.wordpress.org/g-crossposting/trunk@912915 b8457f37-d9ea-0310-8a92-e5e31aec5664