public function __construct(array $config)
 {
     $provider = new LinkedIn(["clientId" => $config["client_id"], "clientSecret" => $config["client_secret"], "redirectUri" => $config["redirect_url"]]);
     parent::__construct($provider);
 }
 public function __construct(array $config)
 {
     $provider = new Facebook(["clientId" => $config["client_id"], "clientSecret" => $config["client_secret"], "redirectUri" => $config["redirect_url"], "graphApiVersion" => "v2.4"]);
     parent::__construct($provider);
 }