updating donate link

git-svn-id: https://plugins.svn.wordpress.org/rename-users/trunk@864138 b8457f37-d9ea-0310-8a92-e5e31aec5664
minor readme.txt changes

git-svn-id: https://plugins.svn.wordpress.org/rename-users/trunk@866255 b8457f37-d9ea-0310-8a92-e5e31aec5664
minor readme.txt changes

git-svn-id: https://plugins.svn.wordpress.org/rename-users/trunk@866256 b8457f37-d9ea-0310-8a92-e5e31aec5664