fix response format version

Author: TorstenDittmann

src/Client.php

@@ -30,7 +30,7 @@ class Client
     protected $headers = [
         'content-type' => '',
         'x-sdk-version' => 'appwrite:cli:0.12.1',
-        'X-Appwrite-Response-Format' => '0.10.0'     ];
+        'X-Appwrite-Response-Format' => '0.11.0'     ];
 
     /**
      * Default User Preferences