code: func (api *Client) OpenGroupContext(ctx context.Context, group string) (bool, bool, error) {
  	values := url.Values{
  		"token":   {api.token},
  		"channel": {group},
  	}
  
  	response, err := api.groupRequest(ctx, "groups.open", values)
  	if err != nil {
  		return false, false, err
  	}
  	return response.NoOp, response.AlreadyOpen, nil
  }
docs: // OpenGroupContext opens a private group with a custom context