code: func (c *Client) ListEnvVars(account, repo string) ([]EnvVar, error) {
  	envVar := []EnvVar{}
  
  	err := c.request("GET", fmt.Sprintf("project/%s/%s/envvar", account, repo), &envVar, nil, nil)
  	if err != nil {
  		return nil, err
  	}
  
  	return envVar, nil
  }
docs: // ListEnvVars list environment variable to the specified project
  // Returns the env vars (the value will be masked)