readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/captcha-bank/trunk@802269 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/captcha-bank/trunk@802995 b8457f37-d9ea-0310-8a92-e5e31aec5664
tags update

git-svn-id: https://plugins.svn.wordpress.org/captcha-bank/trunk@803529 b8457f37-d9ea-0310-8a92-e5e31aec5664
tags update

git-svn-id: https://plugins.svn.wordpress.org/captcha-bank/trunk@804260 b8457f37-d9ea-0310-8a92-e5e31aec5664