v1.8.0

Changed

• Dropped support for Ruby 2.2 (In line with cucumber ruby policies elsewhere)
• All core runtime / development dependencies have been given a massive review / bump where appropriate

Fixed

• Generic rubocop cleanups to improve the codebase
• Rails6 wasn't working since the official rc cut, now it works again.
• Travis has been updated and given a healthcheck to make sure all relevant passing builds do pass
• Ruby 2.7-preview now builds successfully (This is still a moving target, so is allowed to fail)