code: func (c *Client) GetExpandedFormation(appID, releaseID string) (*ct.ExpandedFormation, error) {
  	formation := &ct.ExpandedFormation{}
  	return formation, c.Get(fmt.Sprintf("/apps/%s/formations/%s?expand=true", appID, releaseID), formation)
  }
docs: // GetExpandedFormation returns expanded details for the specified formation
  // under app and release.