Update to 1.707

Upstream changes:
1.707    2018-08-01 22:55:01-05:00 America/Chicago

    [Fixed]

    - The local context hash (`$log->context`) and the log hash
      (`$log->$level( $message, $hash )`) now get merged correctly,
      combining contextual logging and structured logging. Thanks
      @mephinet! [Github #76] [Github #73]

(wen)