updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/easy-mailchimp-opt-in/trunk@985359 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/easy-mailchimp-opt-in/trunk@985364 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/easy-mailchimp-opt-in/trunk@985365 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated mailchimp-optin.php

git-svn-id: https://plugins.svn.wordpress.org/easy-mailchimp-opt-in/trunk@985366 b8457f37-d9ea-0310-8a92-e5e31aec5664