Log Message:
Update to 1.706

Upstream changes:
1.706     2018-07-06 20:20:00-05:00 America/Chicago

    [Fixed]

    - The File, Stderr, and Stdout adapters now correctly allow being
      set to the "emergency" log level threshold. Previously, trying to
      only allow "emergency" log lines would result in all logs being
      written (and a warning about an invalid log level being set).
      Thanks @alabamapaul! [Github #74]