https://medium.com/ovice/elixir%E3%81%A7hot-code-reloading%E3%81%99%E3%82%8B%E3%81%A8%E3%81%8D%E3%81%AB%E6%B0%97%E3%82%92%E3%81%A4%E3%81%91%E3%82%8B%E3%81%93%E3%81%A8-b5058eec86dd
