change of information about compatibility with versions of Wordpress

git-svn-id: https://plugins.svn.wordpress.org/yandex-news/trunk@908764 b8457f37-d9ea-0310-8a92-e5e31aec5664
yet another readme.txt small fix

git-svn-id: https://plugins.svn.wordpress.org/yandex-news/trunk@908767 b8457f37-d9ea-0310-8a92-e5e31aec5664
yet another readme.txt small fix

git-svn-id: https://plugins.svn.wordpress.org/yandex-news/trunk@908769 b8457f37-d9ea-0310-8a92-e5e31aec5664