Update announcements.json

announcements.json

 [
-	{"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":13,"title":"新卡包EP13已经被收录，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":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"},