chore(ci): disabled gecko driver as it's causing issues with Travis build. See https://github.com/an
chore(ci): disabled gecko driver as it's causing issues with Travis build. See https://github.com/an

affects: serenity-js

jan-molak/serenity-js,jan-molak/serenity-js,jan-molak/serenity-js,jan-molak/serenity-js