update notification txt

git-svn-id: https://plugins.svn.wordpress.org/ai-twitter-feeds/trunk@781749 b8457f37-d9ea-0310-8a92-e5e31aec5664
update notice

git-svn-id: https://plugins.svn.wordpress.org/ai-twitter-feeds/trunk@781752 b8457f37-d9ea-0310-8a92-e5e31aec5664