allow installation with doctrine persistence 4

Author: dbu

composer.json

@@ -23,7 +23,7 @@
         "doctrine/collections": "^2.0",
         "doctrine/common": "^2.4 || ^3.0",
         "doctrine/event-manager": "^1.0 || ^2.0",
-        "doctrine/persistence": "^3.0",
+        "doctrine/persistence": "^3.0 || ^4.0",
         "phpcr/phpcr": "^2.1.1",
         "phpcr/phpcr-implementation": "^2.1",
         "phpcr/phpcr-utils": "^1.3.0 || ^2.0",