migrate:contest.models字段改名----show_rank => real_time_rank
migrate:contest.models字段改名----show_rank => real_time_rank

Timeship/OnlineJudge-QDU,wwj718/OnlineJudge,wangmingjob/OnlineJudge,hxsf/OnlineJudge,uestcxl/OnlineJudge,Timeship/OnlineJudge-QDU,uestcxl/OnlineJudge,Timeship/OnlineJudge-1,Timeship/OnlineJudge-1,Timeship/OnlineJudge-QDU,hxsf/OnlineJudge,Timeship/OnlineJudge-QDU,uestcxl/OnlineJudge,hxsf/OnlineJudge,Timeship/OnlineJudge-1,wangmingjob/OnlineJudge,hxsf/OnlineJudge,wangmingjob/OnlineJudge,wwj718/OnlineJudge,wangmingjob/OnlineJudge,wwj718/OnlineJudge,Timeship/OnlineJudge-1