Update domainator core bundle to 1.0.0@alpha

Author: Jelle-S

composer.json

@@ -6,11 +6,12 @@
   "authors": [],
   "support": {},
   "minimum-stability": "dev",
+  "prefer-stable": true,
   "require": {
     "php": ">=7.1",
     "symfony/symfony": ">=3.4",
     "doctrine/orm": "^2.5",
-    "digipolisgent/domainator9k-core-bundle": "dev-develop",
+    "digipolisgent/domainator9k-core-bundle": "^1.0.0-alpha2",
     "guzzlehttp/guzzle": "^6.3"
   },
   "require-dev": {