update to v1.5.5

git-svn-id: https://plugins.svn.wordpress.org/qqworld-auto-save-images/trunk@999104 b8457f37-d9ea-0310-8a92-e5e31aec5664
update v1.5.5 main file

git-svn-id: https://plugins.svn.wordpress.org/qqworld-auto-save-images/trunk@999105 b8457f37-d9ea-0310-8a92-e5e31aec5664