Remove useless dependencies

Author: steevanb

composer.json

@@ -7,12 +7,9 @@
     },
     "require": {
         "php": ">=5.5.9",
-        "doctrine/doctrine-bundle": "^1.6",
-        "doctrine/orm": "^2.5",
         "incenteev/composer-parameter-handler": "^2.0",
         "sensio/distribution-bundle": "^5.0.19",
         "sensio/framework-extra-bundle": "^5.0.0",
-        "symfony/monolog-bundle": "^3.1.0",
         "symfony/polyfill-apcu": "^1.0",
         "symfony/symfony": "3.4.*",
         "phpbenchmarks/symfony": "1.0.0"