Return non-zero exit code on errors

[emmeken]

This is a feature request. If the validator finds any errors, please return a non-zero exit code. That would make it much easier to use the validator in scripts, such as within GitHub Actions.

For warnings, you could either return a different non-zero exit code if there are no errors but there are warnings, or you could add a command line switch for the user to indicate whether warnings should be treated as errors or not.

[Goctionni]

Im sorry I havent been paying attention at all to issues on my repos, I should be able to do a quick fix for this