[logback-dev] [qos-ch/logback-extensions] 15628e: Add CircleCI config

[Tony Trinh]

  Branch: refs/heads/master
  Home:   https://github.com/qos-ch/logback-extensions
  Commit: 15628e5ab4caf4b6645152b4a6fcd643d9b45d69
      https://github.com/qos-ch/logback-extensions/commit/15628e5ab4caf4b6645152b4a6fcd643d9b45d69
  Author: Tony Trinh <tony19 at gmail.com>
  Date:   2018-02-07 (Wed, 07 Feb 2018)

  Changed paths:
    A circle.yml

  Log Message:
  -----------
  Add CircleCI config