code: func (api *Client) RenameConversationContext(ctx context.Context, channelID, channelName string) (*Channel, error) {
  	values := url.Values{
  		"token":   {api.token},
  		"channel": {channelID},
  		"name":    {channelName},
  	}
  	response := struct {
  		SlackResponse
  		Channel *Channel `json:"channel"`
  	}{}
  	err := api.postMethod(ctx, "conversations.rename", values, &response)
  	if err != nil {
  		return nil, err
  	}
  
  	return response.Channel, response.Err()
  }
docs: // RenameConversationContext renames a conversation with a custom context