update

type DefaultVerifier struct {
}

type DefaultVersionCheck struct {
	Command  string
	Argument string
}

type Resolver interface {
	GetRelease() (string, error)
	GetDownloadURL(release string) (string, error)
}

type Updater struct {
	// contains filtered or unexported fields
}

type Verifier interface {
	Verify(digestUrl, newBinary string) error
}

type VersionCheck interface {
	UpdateRequired(target string) (bool, error)
}