fixed composer.json

composer.json

@@ -7,7 +7,7 @@
             "email": "robin@rthoni.com"
         }
     ],
-    "require-dev": {
+    "require": {
       "laravel/lumen-framework": "5.1.x-dev",
       "vlucas/phpdotenv": "~1.0",
       "twig/twig": "1.x-dev"