Hide color escape chars in non-TTY

[iSarCasm]

Currently, out-of-the-box super_diff will continue using colors in non-TTY environments such as CircleCI, etc.

To avoid this, one can simply modify spec_helper.rb like this:

unless config.color
    SuperDiff.configure do |config|
      config.actual_color = :white
      config.expected_color = :white
      config.border_color = :white
      config.header_color = :white
    end
end

Ideally, this gem should automatically detect this case.

I can try and open a PR once confirmed

[mcmire]

Thanks for reporting this. We are doing some detection already here. I suppose for some reason I opted to enable colors on CI. We could remove that part of the logic though. Note that not all colors are getting disabled, so there is more we have to do to get rid of color completely — that is logged in #82 — but removing ENV["CI"] would be a start.