Add compatibility with symfony4

Author: jurv

composer.json

@@ -12,11 +12,11 @@
         "behat/behat": "^3.5.0",
         "behat/mink-extension": "^2.3.1",
         "behat/symfony2-extension": "^2.1.5",
-        "symfony/security": "^3.4",
+        "symfony/security": "^3.4|^4.0",
         "symfony/dom-crawler": "^2.4|^3.0|^4.0",
-        "symfony/translation": "^3.4",
-        "symfony/config": "^3.4",
-        "symfony/dependency-injection": "^3.4",
+        "symfony/translation": "^3.4|^4.0",
+        "symfony/config": "^3.4|^4.0",
+        "symfony/dependency-injection": "^3.4|^4.0",
         "phpunit/php-code-coverage": "^5",
         "phpunit/phpunit": "^6"
     },