Update announcements.json

announcements.json

 [
+    {"id":7,"title":"【第15期管理员招募】正义盟军前线征兵！加入我们，一同与小学生…不对 呸！…与异虫作战，守护DT世界吧！！","url":"https://forum.my-card.in/t/mycard/3270","created_at":"2014-04-25T00:27:06+08:00","updaedt_at":"2014-05-1T10:34:06+08:00"},
     {"id":20,"title":"周赛4月奖励开始！","url":"http://www.duelcn.com/forum.php?mod=viewthread&tid=60680&extra=page%3D1","created_at":"2014-04-1T10:34:06+08:00","updaedt_at":"2014-05-1T10:34:06+08:00"},
     {"id":19,"title":"更新808新卡","url":"https://forum.my-card.in/t/mycard-1-3-5/3040","created_at":"2014-02-18T10:34:06+08:00","updated_at":"2014-02-18T10:34:06+08:00"},
     {"id":18,"title":"游戏王竞赛联盟~周赛","url":"http://www.duelcn.com/thread-59882-1-1.html","created_at":"2013-12-01T18:55:06+08:00","updated_at":"2030-10-22T10:34:06+08:00"},