Update composer.json

Author: christopherhero

composer.json

@@ -8,7 +8,7 @@
         "ext-json": "*",
         "doctrine/collections": "^1.6",
         "doctrine/orm": "^2.7",
-        "doctrine/persistence": "^1.3 || ^2.0",
+        "doctrine/persistence": "^1.3 || ^2.0 || ^3.0",
         "knplabs/knp-menu": "^3.1",
         "league/flysystem": "^1.1 || ^2.1",
         "league/flysystem-bundle": "^1.1 || ^2.4",