outgoing.go
func (om *OutgoingMessage) SetDisableWebPagePreview(to bool) *OutgoingMessage {
	om.DisableWebPagePreview = to
	return om
}
func (om *OutgoingMessage) SetDisableWebPagePreview(to bool) *OutgoingMessage {
	om.DisableWebPagePreview = to
	return om
}
// SetDisableWebPagePreview disables web page previews for the message
// (optional).