[Feature request] Fail command if peer deps are not met about check-peer-dependencies

[gonadarian]

And while testing this library out actually, I just realized that this is already supported? Call fails with process.exit(1) if there are peer warnings: https://github.com/christopherthielen/check-peer-dependencies/blob/master/src/checkPeerDependencies.ts#L171.

[gonadarian]

Maybe exactly the same as is done for yarn-deduplicate with --fail option: https://github.com/scinos/yarn-deduplicate#usage-in-ci. Supporting --fail would be a backwards compatible change as well as nothing would change when that is not supplied.

[christopherthielen]

Yes, as @gonadarian noticed, the process already exits with non-zero error code if anything fails, or peer deps are unsatisfied.