updated docs with the new guzzle5 imageinfo

Author: oscarotero

README.md

@@ -196,6 +196,7 @@ Like the resolver class, you can provide your own image class (it must implement
 
 
 ```php
+//CURL
 $config = [
     'image' => [
         'class' => 'Embed\\ImageInfo\\Curl' //The default imageInfo used
@@ -213,6 +214,17 @@ $config = [
         ]
     ]
 ];
+
+// Guzzle (5.x)
+$config = [
+    'resolver' => [
+        'class' => 'Embed\\ImageInfo\\Guzzle5',
+
+        'config' => [
+            'client' => $myGuzzleClient,
+        ]
+    ]
+];
 ```
 
 [You can see here](https://github.com/oscarotero/Embed/tree/master/src/ImageInfo) the ImageInfo implementations included.