Unable to call domain.create()

[kiyose]

There is a typo on doctl.py#L254.

        return self.do.doctl(
            "compute", "domain", create, domain, "--ip-address", ip_address
        )

'create' needs to be quoted

        return self.do.doctl(
            "compute", "domain", "create", domain, "--ip-address", ip_address
        )

I've fixed it in PR #12