Fix mailmap in preparation for v0.22
Prepare changes for v0.22
v0.22

        [NEW FEATURES]
        - Improved error messaging for Saucelabs non-json cases
        - Improved error messaging for malconfigured chromedrivers
        - #169 Add maximize_window function
        - #58 Add get_user_agent function

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

        [BREAKING]
        - #161 get|set_speed subs are no-ops and will be removed in
          the upcoming release
        - #158 WebElement's drag function is deprecated and will be
          removed in the upcoming release. Use mouse_move_to_location
          in the interim