Add support for publishing to an organization

[rhalff]

I use this tool often because it's so simple to use, however it does not allow to publish to an organization because npm publish defaults to private for organizations.

This pull request automatically adds --access public if the package is from an organization.

See: https://www.npmjs.com/docs/orgs/publishing-an-org-scoped-package.html#publishing-a-public-scoped-package