Use maximum available width by default

[jamadagni]

Hello. I tried hexyl and find it very nice.

However, it currently uses too less a part of my screen. It would be more efficient if it used the maximum width available. Please enable this by default.

There can be an option to output to a fixed width which is related to #13.

Thank you!

[sharkdp]

Thank you very much for your feedback. That request is already included in #13 (see --auto-width).

[sharkdp]

see also: #182