update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/qqworld-auto-save-images/trunk@986899 b8457f37-d9ea-0310-8a92-e5e31aec5664
udpate readme.txt again

git-svn-id: https://plugins.svn.wordpress.org/qqworld-auto-save-images/trunk@986900 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixed readme.txt

git-svn-id: https://plugins.svn.wordpress.org/qqworld-auto-save-images/trunk@986901 b8457f37-d9ea-0310-8a92-e5e31aec5664