update readme

git-svn-id: https://plugins.svn.wordpress.org/apocalypse-meow/trunk@793736 b8457f37-d9ea-0310-8a92-e5e31aec5664
release 1.4.5

git-svn-id: https://plugins.svn.wordpress.org/apocalypse-meow/trunk@794153 b8457f37-d9ea-0310-8a92-e5e31aec5664