v3.7.2 released

git-svn-id: https://plugins.svn.wordpress.org/social-locker/trunk@1006494 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt updated

git-svn-id: https://plugins.svn.wordpress.org/social-locker/trunk@1006496 b8457f37-d9ea-0310-8a92-e5e31aec5664