Return 401 in all cases of failure

[robsliwi]

In some cases buffalo would return a 500 instead
of a 401 when the authorization fails.
This commit should fix this behavior, see
discussion in Slack:
https://gophers.slack.com/archives/C3MSAFD40/p1543923920092000

[markbates]

The tests are failing for this, can you please take a look? Thanks.

[robsliwi]

Thanks for the contributing link, should have checked this before making the PR 😇
Updated and rebased it, you can have a second look if you want.

[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment. Otherwise, this will be closed in 7 days.

[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment. Otherwise, this will be closed in 7 days.

[sio4]

Thank you for your contribution, and sorry for the late review.

Could you please check the comments and fix them? I will proceed with this PR after that.
If you have no interest in this module anymore, not sure since it is already more than four years ago, just ignore this message. I will work on it soon.

[robsliwi]

Thanks for picking this up!
Was quite a joy to clone the repo again, set up some Golang-dev-env and get this fixed.

Rebased, pushed, realized two commits, squashed them and all of the requested changes should be included by now 🤞

all the reviews were addressed and Mark is not actively work on here nowadays

[sio4]

Thanks!

[sio4]

Just for your information, I made some more changes to the topic and filed PR #7. Just in case you are interested.