📝 Update README.md (#825)

fuel/README.md

@@ -596,6 +596,32 @@ The `stream` variant expects your callback to provide a `Pair` with both the `Ou
   - use an `EmptyDeserializer` with `await(deserializer)` or one of the `response(deserializer)` variants
   - provide an `InputStream` callback that `throws` or returns an empty `InputStream`.
 
+For downloading larger files it is good to use `request.streamDestination { }` instead of `request.fileDestination { }`
+
+```kotlin
+val outputStream = FileOutputStream(File(filePath))
+
+Fuel.download("https://httpbin.org/bytes/32768")
+    .streamDestination { response, request -> Pair(outputStream, { request.body.toStream() }) }
+    .progress { readBytes, totalBytes ->
+        val progress = readBytes.toFloat() / totalBytes.toFloat() * 100
+        println("Bytes downloaded $readBytes / $totalBytes ($progress %)")
+    }
+    .response { result -> 
+
+        result.fold(
+
+                success = {
+
+                },
+
+                failure = {
+
+                }
+        )
+    }
+```
+
 ### Cancel an async `Request`
 
 The `response` functions called with a `handler` are async and return a `CancellableRequest`. These requests expose a few extra functions that can be used to control the `Future` that should resolve a response: