Fix call to deprecated JsonResponse::create() (#947)

Author: joecampo

src/HttpApi/Controllers/Controller.php

@@ -80,7 +80,7 @@ protected function checkContentLength(ConnectionInterface $connection)
                 ->ensureValidAppId($laravelRequest->appId)
                 ->ensureValidSignature($laravelRequest);
 
-            $response = JsonResponse::create($this($laravelRequest));
+            $response = new JsonResponse($this($laravelRequest));
 
             $content = $response->content();