code: func (g *Gitlab) ProjectDeployKeys(id string) ([]*SshKey, *ResponseMeta, error) {
  	u := g.ResourceUrl(ProjectDeployKeysApiPath, map[string]string{":id": id})
  
  	var deployKeys []*SshKey
  
  	contents, meta, err := g.buildAndExecRequest("GET", u.String(), nil)
  	if err == nil {
  		err = json.Unmarshal(contents, &deployKeys)
  	}
  
  	return deployKeys, meta, err
  }
docs: /*
  Get list of project deploy keys.
  
      GET /projects/:id/keys
  
  Parameters:
  
      id The ID of a project
  
  */