Option to set log level

[Archmonger]

Is your feature request related to a problem? Please describe.
Currently spelling issues are always console warnings.

Describe the solution you'd like
I'd like the ability to set them to errors, in order to use mkdocs-spellcheck within GitHub Actions workflows.

I basically want mkdocs build to fail on spelling errors, but print out all the spelling errors to console before failing.

Describe alternatives you've considered
N/A

Additional context
N/A

[pawamoy]

I believe that's exactly what you get with MkDocs' strict mode: mkdocs build -s.

[Archmonger]

Yep I must've missed that. Thanks!