Fix builds

Author: dunglas

composer.json

@@ -42,7 +42,7 @@
         "psr/log": "^1.0",
         "symfony/asset": "^2.7 || ^3.0",
         "symfony/cache": "^3.1",
-        "symfony/config": "^2.7 || ^3.0",
+        "symfony/config": "^3.2",
         "symfony/dependency-injection": "^2.7 || ^3.0",
         "symfony/doctrine-bridge": "^2.8 || ^3.0",
         "symfony/phpunit-bridge": "^2.7 || ^3.0",