v1.18.2

1.[Event] Separated single-event query from event-list query
2.[Announcement] Separated single-announcement query from announcement-list query
3.[User] Changed PUT /user/unban to DELETE /user/ban
4.[User] Changed ban.ban_reason response to ban.reason
5.[Challenge] Added completed field in GET /challenge response
6.[Challenge] Fixed various bugs of this plugin
7.Added form string length limit