Allow Symfony4

composer.json

@@ -21,12 +21,12 @@
         "sonata-project/admin-bundle": "^3.28",
         "sonata-project/block-bundle": "^3.8",
         "sonata-project/core-bundle": "^3.7.1",
-        "symfony/config": "^2.8 || ^3.2",
-        "symfony/dependency-injection": "^2.8 || ^3.2",
-        "symfony/form": "^2.8 || ^3.2",
-        "symfony/http-foundation": "^2.8 || ^3.2",
-        "symfony/http-kernel": "^2.8 || ^3.2",
-        "symfony/options-resolver": "^2.8 || ^3.2",
+        "symfony/config": "^2.8 || ^3.2 || ^4.0",
+        "symfony/dependency-injection": "^2.8 || ^3.2 || ^4.0",
+        "symfony/form": "^2.8 || ^3.2 || ^4.0",
+        "symfony/http-foundation": "^2.8 || ^3.2 || ^4.0",
+        "symfony/http-kernel": "^2.8 || ^3.2 || ^4.0",
+        "symfony/options-resolver": "^2.8 || ^3.2 || ^4.0",
         "twig/twig": "^1.35 || ^2.4"
     },
     "require-dev": {
@@ -35,8 +35,8 @@
         "matthiasnoback/symfony-dependency-injection-test": "^1.0",
         "sonata-project/doctrine-orm-admin-bundle": "^3.2",
         "stof/doctrine-extensions-bundle": "^1.1",
-        "symfony/framework-bundle": "^2.8 || ^3.2",
-        "symfony/phpunit-bridge": "^3.3"
+        "symfony/framework-bundle": "^2.8 || ^3.2 || ^4.0",
+        "symfony/phpunit-bridge": "^3.3 || ^4.0"
     },
     "suggest": {
         "doctrine/phpcr-odm": "if you translate odm documents",