Add support for ^3.3 version of symfony/dependency-injection

Author: bbatsche

composer.json

@@ -10,7 +10,7 @@
         "composer/composer": "@stable",
         "symfony/config": "^2.8||^4.4",
         "symfony/console": "^2.8||^4.0",
-        "symfony/dependency-injection": "^2.8||^4.3",
+        "symfony/dependency-injection": "^3.3||^4.3",
         "symfony/process": "^2.1||^4.1"
     },
     "conflict": {