Feature: ModifiableshowVersion() method

[DRSDavidSoft]

Feature Request

I would like to be able to use a custom showVersion() method, so I can also display the package name in addition to the version.

How about this?

args.showVersion = function(version, pkg) {
  return `${pkg} v${version}`
}

That would be so nice!

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nb: I assume that you are already parsing the package version from package.json, so it'd be cool to also get the package name from it, and pass it to the function.