code: func (api *Client) CreateChannelContext(ctx context.Context, channelName string) (*Channel, error) {
  	values := url.Values{
  		"token": {api.token},
  		"name":  {channelName},
  	}
  
  	response, err := api.channelRequest(ctx, "channels.create", values)
  	if err != nil {
  		return nil, err
  	}
  	return &response.Channel, nil
  }
docs: // CreateChannelContext creates a channel with the given name and returns a *Channel with a custom context
  // see https://api.slack.com/methods/channels.create