Update announcements.json

announcements.json

@@ -11,5 +11,4 @@
     {"id":3,"title":"可以使用手机登录聊天室了 <-戳我查看详情","url":"https://github.com/mycard/mycard/wiki/聊天室","created_at":"2013-03-09T18:12:07+08:00","updated_at":"2013-03-09T07:12:08+08:00"},
     {"id":1,"title":"网页大厅测试中,需要本机安装了mycard才能用哦","url":"http://my-card.in/rooms/","created_at":"2013-02-19T18:12:07+08:00","updated_at":"2013-02-19T07:12:08+08:00"},
     {"id":4,"title":"QQ群: Mycard - 萌卡(225669895)","url":"http://qun.qzone.qq.com/group#!/225669895/home","created_at":"2013-02-19T18:12:07+08:00","updated_at":"2013-02-19T07:12:08+08:00"}
-    
 ]