v0.2151

        [NEW FEATURES]
        - Improved error messaging for Saucelabs non-json cases
        - Improved error messaging for incorrectly configured chromedrivers

        [MAINTENAINCE]
        - Specify minimum compatible version of Moo dep
        - Make Driver.pm more easily subclassed ( ea68e06, 63e78e3 )
        - Get TravisCI passing again
        - Roll & use our own mocking classes #164

        [BREAKING]
        - get|set_speed subs are no-ops and will be removed in the
        upcoming release

[skip ci]