5.1 small bug fix

git-svn-id: https://plugins.svn.wordpress.org/post-thumbnail-extras/trunk@982765 b8457f37-d9ea-0310-8a92-e5e31aec5664
change the donation link

git-svn-id: https://plugins.svn.wordpress.org/post-thumbnail-extras/trunk@982766 b8457f37-d9ea-0310-8a92-e5e31aec5664