Added contributors to the *readme*

git-svn-id: https://plugins.svn.wordpress.org/wp-bcrypt/trunk@929604 b8457f37-d9ea-0310-8a92-e5e31aec5664
Bumped stable tag

git-svn-id: https://plugins.svn.wordpress.org/wp-bcrypt/trunk@929605 b8457f37-d9ea-0310-8a92-e5e31aec5664