Fix deprecated example

README.md

@@ -89,7 +89,7 @@ Create a `<video>` element where the web cam video stream should get rendered:
 
 #### 2. Create a QrScanner Instance
 ```js
-const qrScanner = new QrScanner(videoElem, result => console.log('decoded qr code:', result));
+const qrScanner = new QrScanner(videoElem, result => console.log('decoded qr code:', result), {});
 ```
 
 As an optional third parameter an options object can be provided.