Add a yml config parameter declaring which html codes to be reported

[mmattel]

Is your feature request related to a problem? Please describe.
When checking a site, you may get tons of results but you manually have to filter those which have a 404.
The quantity of printed results are often based on that you have to login on the target page before but these pages are not 404. The 404´s are the ones you are looking for to be fixed.

Describe the solution you'd like
Adding a yml config value which defines html return codes to be reported, like 404 or 4??

Describe alternatives you've considered
Exporting the text result to excel and filter manually, but this is a pain

Additional context