Add support for symfony 5 🚀 (#23)

Author: Baachi

composer.json

@@ -11,10 +11,10 @@
     ],
     "require": {
         "php": "^5.5 || ^7.0",
-        "symfony/dependency-injection": "^3.4 || ^4.3",
-        "symfony/framework-bundle": "^3.4 || ^4.3",
-        "symfony/http-kernel": "^3.4 || ^4.3",
-        "symfony/yaml": "^3.4 || ^4.3"
+        "symfony/dependency-injection": "^3.4 || ^4.3 || ^5.0",
+        "symfony/framework-bundle": "^3.4 || ^4.3 || ^5.0",
+        "symfony/http-kernel": "^3.4 || ^4.3 || ^5.0",
+        "symfony/yaml": "^3.4 || ^4.3 || ^5.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.36 || ^5.5 || ^6.2"