Added Symfony v5 depndencies

Author: jdomenechb

composer.json

@@ -14,8 +14,8 @@
         "php": ">=7.1",
         "react/http": "^0.8.0",
         "symfony/http-foundation": "^4.0",
-        "symfony/console": "^4.0",
-        "symfony/http-kernel": "^4.0",
+        "symfony/console": "^4.0|^5.0",
+        "symfony/http-kernel": "^4.0|^5.0",
         "ralouphie/mimey": "^2.1"
     },
     "require-dev": {