Add back some conflict rules

nicolas-grekas · nicolas-grekas · commit b2c8e491b7de · 2019-05-29T09:31:53.000+02:00
diff --git a/composer.json b/composer.json
@@ -36,6 +36,9 @@
         "symfony/validator": "^4.4|^5.0",
         "symfony/var-dumper": "^4.4|^5.0"
     },
+    "conflict": {
+        "symfony/event-dispatcher": "<4.4"
+    },
     "suggest": {
         "enqueue/messenger-adapter": "For using the php-enqueue library as a transport."
     },
