code: func (c *Config) RenewCert(name string, allowPrompts bool) error {
  	client, err := newACMEClient(c, allowPrompts)
  	if err != nil {
  		return err
  	}
  	return client.Renew(name)
  }
docs: // RenewCert renews the certificate for name using c. It stows the
  // renewed certificate and its assets in storage if successful.