No specific error code for JWT errors

[jcampbell05]

Prerequisites

• [ ] Is it a bug?
• [x ] Is it a new feature?
• [ ] Is it a a question?
• [ ] Can you reproduce the problem?
• [ ] Are you running the latest version?
• [ ] Did you check for similar issues?
• [ ] Did you perform a cursory search?

For more information, see the CONTRIBUTING guide.

Description

When there is a JWT issue the error returned will be a HTTP code 200 and the error message won't have any specific error code that can be used to identify the issue without comparing the error message itself (bad idea)

It would be great if a 400 error code could be returned or a specific error type i.e "UNAUTHENTICATED" could be returned to identify this issue

[PedroBern]

Related to #55, we definitely can change this if you can work on a PR :)

[jcampbell05]

@PedroBern sure thing it's not super high priority in the current project I am working on but I'll contribute any tweaks I make