update readme

README.md

@@ -84,30 +84,33 @@ As long as you update the environment variable below to point to *your* JSON
 credentials file, the following code should output a list of your Drive files.
 
 ```php
-use GuzzleHttp\Client;
 use Google\Auth\ApplicationDefaultCredentials;
+use GuzzleHttp\Client;
+use GuzzleHttp\HandlerStack;
 
 // specify the path to your application credentials
 putenv('GOOGLE_APPLICATION_CREDENTIALS=/path/to/my/credentials.json');
 
 // define the scopes for your API call
 $scopes = ['https://www.googleapis.com/auth/drive.readonly'];
 
+// create middleware
+$middleware = ApplicationDefaultCredentials::getMiddleware($scopes);
+$stack = HandlerStack::create();
+$stack->push($middleware);
+
 // create the HTTP client
 $client = new Client([
+  'handler' => $stack
   'base_url' => 'https://www.googleapis.com',
-  'defaults' => ['auth' => 'google_auth']  // authorize all requests
+  'auth' => 'google_auth'  // authorize all requests
 ]);
 
-// attach this library's auth listener
-$fetcher = ApplicationDefaultCredentials::getFetcher($scopes);
-$client->getEmitter()->attach($fetcher);
-
 // make the request
 $response = $client->get('drive/v2/files');
 
 // show the result!
-print_r($response->json());
+print_r((string) $response->getBody());
 ```
 
 ## What about auth in google-apis-php-client?