build: correctly require doctrine/persistence

Author: gsdevme

composer.json

@@ -25,6 +25,7 @@
         "mtdowling/cron-expression": "1.0.*",
         "doctrine/orm": "~2.7",
         "doctrine/collections": "^1.6",
+        "doctrine/persistence": "^1.3",
         "php-amqplib/rabbitmq-bundle": "^1.14",
         "snc/redis-bundle": "~1.1.2|^2",
         "markup/rabbitmq-management-api": ">=2.1.1",