CI（継続的インテグレーション）環境の構築
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.. todo::

   travis、circle.ci、gitlab-ciの設定を紹介。あとはJenkins？

   https://qiita.com/nju33/items/72992bd4941b96bc4ce5

   https://qiita.com/naokikimura/items/f1c8903eec86ec1de655