### 過去のAdvent Calendar
[Akatsuki Advent Calendar 2016](https://qiita.com/advent-calendar/2016/aktsk)
[Akatsuki Advent Calendar 2017](https://qiita.com/advent-calendar/2017/aktsk)
[Akatsuki Advent Calendar 2018](https://adventar.org/calendars/2990)
[Akatsuki Advent Calendar 2019](https://adventar…