fixed missing use statement

fabpot · fabpot · commit 38968efce68e · 2018-04-02T12:03:31.000+02:00
diff --git a/src/Symfony/Component/Form/FormRenderer.php b/src/Symfony/Component/Form/FormRenderer.php
@@ -14,6 +14,7 @@
 use Symfony\Component\Form\Exception\LogicException;
 use Symfony\Component\Form\Exception\BadMethodCallException;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
+use Twig\Environment;
 
 /**
  * Renders a form into HTML using a rendering engine.
