Update Doctrine ORM lower bound

Author: ondrejmirtes

composer.json

@@ -25,7 +25,7 @@
 		"doctrine/dbal": "^2.13.8 || ^3.3.3",
 		"doctrine/lexer": "^2.0 || ^3.0",
 		"doctrine/mongodb-odm": "^1.3 || ^2.4.3",
-		"doctrine/orm": "^2.14.0",
+		"doctrine/orm": "^2.16.0",
 		"doctrine/persistence": "^2.2.1 || ^3.2",
 		"gedmo/doctrine-extensions": "^3.8",
 		"nesbot/carbon": "^2.49",