[logback-dev] [qos-ch/logback-extensions] bb5bc7: Update CircleCI config

[Tony Trinh]

  Branch: refs/heads/master
  Home:   https://github.com/qos-ch/logback-extensions
  Commit: bb5bc7b5529051cb9040acbcc999bf724305b54d
      https://github.com/qos-ch/logback-extensions/commit/bb5bc7b5529051cb9040acbcc999bf724305b54d
  Author: Tony Trinh <tony19 at gmail.com>
  Date:   2018-02-08 (Thu, 08 Feb 2018)

  Changed paths:
    M circle.yml

  Log Message:
  -----------
  Update CircleCI config