updated Readme.md

Author: ArthurStam

Readme.md

@@ -39,4 +39,5 @@ window.Telegram.WebApp.HapticFeedback.notificationOccurred("success");
 - [`PopupParams`](https://core.telegram.org/bots/webapps#popupparams)
 - [`PopupButton`](https://core.telegram.org/bots/webapps#popupbutton)
 - [`WebApp`](https://core.telegram.org/bots/webapps#initializing-web-apps)
+- [`ScanQrPopupParams`](https://core.telegram.org/bots/webapps#scanqrpopupparams)
 - `Platforms`