code: func NotifyTugboat(d Deployer, url string) *TugboatDeployer {
  	c := tugboat.NewClient(nil)
  	c.URL = url
  	return &TugboatDeployer{
  		deployer: d,
  		client:   c,
  	}
  }
docs: // NotifyTugboat wraps a Deployer to sent deployment logs and status updates to
  // a Tugboat instance.