feature request: Add blacklist.

[molingyu]

支持黑名单，遇到黑名单内的用户，其创建的issue直接被关闭。

[xuexb]

赞👍🏻 获取 Outlook for iOS On Thu, May 31, 2018 at 9:27 PM +0800, "简单搜索" <notifications@github.com> wrote: Assigned #56 to @xuexb. — You are receiving this because you were assigned. Reply to this email directly, view it on GitHub, or mute the thread.