Fixed example in Readme

index.md

@@ -284,7 +284,9 @@ locating-mechanism for more robust results.
 
 ```javascript
 Quagga.decodeSingle({
-  readers: ['code_128_reader'],
+    decoder: {
+        readers: ["code_128_reader"] // List of active readers
+    },
     locate: true, // try to locate the barcode in the image
     src: '/test/fixtures/code_128/image-001.jpg' // or 'data:image/jpg;base64,' + data
 }, function(result){