add airplay

CHANGELOG_CN.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - art.play() 方法统一返回 Promise
 - play 事件改为异步触发
 - 添加事件列表到 d.ts
+- 新增 airplay (隔空播放) 功能
 
 ## [4.5.2] - 2022-6-22