Fix compatibility

Author: kylekatarnls

src/PugRenderer.php

@@ -7,6 +7,7 @@
 use Psr\Http\Message\ResponseInterface;
 use Pug\Pug;
 use Slim\App;
+use Slim\Psr7\Factory\ResponseFactory;
 
 /**
  * Class PugRenderer.
@@ -56,7 +57,9 @@ public function __construct($templatePath = null, $options = [], $attributes = [
     public static function create(?App $app = null, $templatePath = null, array $options = [], array $attributes = [])
     {
         if (!$app) {
-            $app = new App();
+            $app = defined(App::class . '::VERSION') && ((int) App::VERSION) >= 4
+                ? new App(new ResponseFactory())
+                : new App();
         }
 
         $container = $app->getContainer();

tests/AbstractTestCase.php

@@ -5,14 +5,14 @@
 use DI\ContainerBuilder;
 use PHPUnit\Framework\TestCase;
 use RuntimeException;
+use Slim\App;
+use Slim\Factory\AppFactory;
 use Slim\Http\Body as Slim3Body;
 use Slim\Http\Headers as Slim3Headers;
 use Slim\Http\Request as Slim3Request;
 use Slim\Http\Response as Slim3Response;
 use Slim\Http\Stream as Slim3Stream;
 use Slim\Http\Uri as Slim3Uri;
-use Slim\App;
-use Slim\Factory\AppFactory;
 use Slim\Psr7\Headers;
 use Slim\Psr7\Request;
 use Slim\Psr7\Stream;