fixed readme

git-svn-id: https://plugins.svn.wordpress.org/esse-captcha/trunk@834937 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed readme test2

git-svn-id: https://plugins.svn.wordpress.org/esse-captcha/trunk@834939 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed readme test3

git-svn-id: https://plugins.svn.wordpress.org/esse-captcha/trunk@834941 b8457f37-d9ea-0310-8a92-e5e31aec5664