code: func (buttons *InlineButtons) Append(data string, text string) {
  	if len(data) > 64 {
  		log.WithField("text", text).Errorf("InlineButton data '%s' extends 64 bytes limit", data)
  	}
  	*buttons = append(*buttons, InlineButton{Data: data, Text: text})
  }
docs: // Append adds 1 or more InlineButton (column) to the end of InlineButtons(row)