code: func (c *CustomerIO) DeleteDevice(customerID string, deviceID string) error {
  	status, responseBody, err := c.request("DELETE", c.deleteDeviceURL(customerID, deviceID), []byte{})
  
  	if err != nil {
  		return err
  	} else if status != 200 {
  		return &CustomerIOError{status, c.deleteDeviceURL(customerID, deviceID), responseBody}
  	}
  
  	return nil
  }
docs: // DeleteDevice deletes a device for a customer