Update announcements.json

announcements.json

 [
-	{"id":12,"title":"服务器故障，房间列表暂不可用，请用匹配","url":"https://github.com/mycard/mycard/wiki/%E7%A7%AF%E5%88%86","created_at":"2013-05-15T18:12:07+08:00","updated_at":"2013-05-15T07:12:08+08:00"},
+	{"id":13,"title":"已更新806新卡，戳我查看新卡列表","url":"https://goo.gl/82VU2","created_at":"2013-05-21T18:12:07+08:00","updated_at":"2013-05-21T07:12:08+08:00"},
 	{"id":10,"title":"和我签下契约，成为魔法少女吧 (招募开发者/管理员) <-戳我","url":"https://my-card.in/humans", "created_at":"2013-04-13T18:12:07+08:00","updated_at":"2013-04-13T07:12:08+08:00"},
-	{"id":9,"title":"卡组分享系统测试中，有问题或建议请到G+ mycard社群吐槽","url":"https://plus.google.com/communities/112748610591305626436", "created_at":"2013-04-02T18:12:07+08:00","updated_at":"2013-04-02T07:12:08+08:00"},
 	{"id":8,"title":"mycard可以使用Google账号登录了<-戳我查看详情","url":"https://github.com/mycard/mycard/wiki/%E7%94%A8%E6%88%B7", "created_at":"2013-03-25T18:12:07+08:00","updated_at":"2013-03-25T07:12:08+08:00"},
 	{"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"},