upped to v3.1.2 for readme change

git-svn-id: https://plugins.svn.wordpress.org/custom-menu-wizard/trunk@1013503 b8457f37-d9ea-0310-8a92-e5e31aec5664
release v3.1.2

git-svn-id: https://plugins.svn.wordpress.org/custom-menu-wizard/trunk@1013508 b8457f37-d9ea-0310-8a92-e5e31aec5664