Add option to display headers for « ipfs object links ».

[palkeo]

See #1086

[whyrusleeping]

to fully address #1086 we should make the default not to print this, but add a --headers flag that enables their being printed.

[palkeo]

Done. It should be all good now, I think :)

[whyrusleeping]

last nitpick: run gofmt on your code to fix indentation.

Thanks!

[GitCop]

There were the following issues with your Pull Request

• Commit: 606c1c8
  • Invalid signoff. Commit message must end with
    License: MIT
    Signed-off-by: .* <.*>

We ask for a few features in the commit message for Open Source licensing hygiene and commit message clarity.
git commit --amend can often help you quickly improve the commit message.
Guidelines and a script are available to help in the long run.
Your feedback on GitCop is welcome on this issue.

---

This message was auto-generated by https://gitcop.com

[palkeo]

Done :)

[whyrusleeping]

Cool, LGTM, thank you! 🚢