https://blog.wongcw.com/2019/01/17/appannie-2018%e5%b9%b4%e5%ba%a6%e6%89%8b%e6%b8%b8%e5%a0%b1%e5%91%8a%ef%bc%9a%e5%90%84%e5%8d%80%e5%9f%9f%e6%9c%80%e5%bc%b7%e7%8e%8b%e8%80%85%e6%9b%9d%e5%85%89/