https://blog.offline-net.com/2013/03/31/mac%ef%bc%9aneobundle%ef%bc%8bzencoding-vim%e3%81%a7%e5%80%8d%e9%80%9f%e3%82%b3%e3%83%bc%e3%83%87%e3%83%b3%e3%82%b0%e3%81%97%e3%81%9f%e3%81%84/