Updated Storage.php

This change has been generated by a script that has detected changes in the
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Author: silvolu

src/Google/Service/Storage.php

@@ -234,6 +234,10 @@ public function __construct(Google_Client $client)
                   'location' => 'query',
                   'type' => 'string',
                 ),
+                'prefix' => array(
+                  'location' => 'query',
+                  'type' => 'string',
+                ),
                 'projection' => array(
                   'location' => 'query',
                   'type' => 'string',
@@ -1140,6 +1144,8 @@ public function insert($project, Google_Service_Storage_Bucket $postBody, $optPa
    *
    * @opt_param string pageToken A previously-returned page token representing
    * part of the larger set of results to view.
+   * @opt_param string prefix Filter results to buckets whose names begin with
+   * this prefix.
    * @opt_param string projection Set of properties to return. Defaults to noAcl.
    * @opt_param string maxResults Maximum number of buckets to return.
    * @return Google_Service_Storage_Buckets