Channel posts in webhook ProcessUpdate

[oneart-dev]

Currently channel post are not properly processed in webhook.

func (b *Bot) ProcessUpdate(ctx context.Context, upd *models.Update) {
	h := b.defaultHandlerFunc

	defer func() {
		applyMiddlewares(h, b.middlewares...)(ctx, b, upd)
	}()

	if upd.Message != nil {
		h = b.findHandler(HandlerTypeMessageText, upd)
		return
	}
	if upd.CallbackQuery != nil {
		h = b.findHandler(HandlerTypeCallbackQueryData, upd)
		return
	}
}

This need to be updated as well as this:

        // handlers.go
	switch h.handlerType {
	case HandlerTypeMessageText:
		data = update.Message.Text
	case HandlerTypeCallbackQueryData:
		data = update.CallbackQuery.Data
	}