added neos 4.0 composer constraint

Author: breadlesscode

composer.json

@@ -13,7 +13,7 @@
     ],
     "require": {
         "php": "^7.1",
-        "neos/neos": "^5.0",
+        "neos/neos": "^4.0 | ^5.0",
         "neos/fusion-form": "*",
         "league/flysystem": "^1.0",
         "league/csv": "^9.5",