Updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/aa-counter/trunk@1003696 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt updated

git-svn-id: https://plugins.svn.wordpress.org/aa-counter/trunk@1003700 b8457f37-d9ea-0310-8a92-e5e31aec5664