Added method phpdoc.

Author: stackpr

lib/Github/Client.php

@@ -31,6 +31,7 @@
  * @method Api\Repo repos()
  * @method Api\Repo repository()
  * @method Api\Repo repositories()
+ * @method Api\Search search()
  * @method Api\Organization team()
  * @method Api\Organization teams()
  * @method Api\User user()