Merge pull request #38 from pgodel/feature/symfony4

Allow Symfony 4.0 in composer.json

Author: stloyd

composer.json

@@ -14,7 +14,7 @@
     ],
     "require": {
         "php": "^7.0",
-        "symfony/config": "^2.3|^3.0"
+        "symfony/config": "^2.3 || ^3.0 || ^4.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.0"