Explicitly require "doctrine/common"

Author: phansys

composer.json

@@ -26,6 +26,7 @@
     ],
     "require": {
         "php": "^5.6 || ^7.0",
+        "doctrine/common": "^2.7",
         "doctrine/doctrine-bundle": "^1.4 || ^2.0",
         "doctrine/orm": "^2.4.8",
         "knplabs/knp-paginator-bundle": "^2.6 || ^3.4 || ^4.0 || ^5.0",