update compatible version

git-svn-id: https://plugins.svn.wordpress.org/prettygallery/trunk@1044415 b8457f37-d9ea-0310-8a92-e5e31aec5664
add github url

git-svn-id: https://plugins.svn.wordpress.org/prettygallery/trunk@1044417 b8457f37-d9ea-0310-8a92-e5e31aec5664