Allow doctrine/persistence 2

Author: derrabus

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=7.1.3",
         "doctrine/event-manager": "~1.0",
-        "doctrine/persistence": "^1.3",
+        "doctrine/persistence": "^1.3|^2",
         "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/service-contracts": "^1.1|^2"