Feature: Option to only show failing/passing packages

[gteufelberger]

Feature Details

When running licensecheck the resulting output shows the list of all packages, their licenses, and whether they are compatible with the current project.
To quickly filter out out packages that are incompatible with the current project's license it would be nice to have an argument like --only-show-failing that reduces the output to just the packages that don't match the current license.

So if you for example have a project with over a hundred dependencies, running something like licensecheck --only-show-failing would be a nice and quick way to only show the few dependencies that are not compatible with the current license.

Describe alternatives you've considered

Alternative would be to pipe output into grep or other unix tools to filter it down to just that passing/failing licenses.

Additional Context

I'd be willing to implement this feature myself and make a PR. I'm just not sure where the best place would be to start working on this ^^"