threadsettings.go
func (m *Messenger) DeleteGetStartedButton() error {
	result, err := m.changeThreadSettings(http.MethodDelete, &threadSettings{
		Type:  settingTypeCallToActions,
		State: threadStateNew,
	})
	if err != nil {
		return err
	}
	if result.Result != "Successfully deleted all new_thread's CTAs" {
		return fmt.Errorf("Error occured while deleting get started button, invalid result: %s", result.Result)
	}
	return nil
}
func (m *Messenger) DeleteGetStartedButton() error {
	result, err := m.changeThreadSettings(http.MethodDelete, &threadSettings{
		Type:  settingTypeCallToActions,
		State: threadStateNew,
	})
	if err != nil {
		return err
	}
	if result.Result != "Successfully deleted all new_thread's CTAs" {
		return fmt.Errorf("Error occured while deleting get started button, invalid result: %s", result.Result)
	}
	return nil
}
// DeleteGetStartedButton delets a button set by SetGetStartedButton