Indicate support for doctrine/persistence 3

Author: derrabus

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=7.1.3",
         "doctrine/event-manager": "~1.0",
-        "doctrine/persistence": "^1.3|^2",
+        "doctrine/persistence": "^1.3|^2|^3",
         "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/polyfill-php80": "^1.16",