Please print something for every error

[rrthomas]

Pretty-printing does a nice job of making error messages pretty, but when it gets an error object it doesn't understand, it doesn't print anything. For example, I got this error:

{
  reason: 'FREE_TIER_EXCEEDED',
  details: 'You have exceeded the free tier data limit! Please add a credit card to your profile to continue pinning content with Pinata.'
}

oclif/errors doesn't look at the fields reason or details, so my program just quit with status of 1 but no error message.

It would be good if something were always printed, even if it's uglier in the case of errors that oclif can't parse.