Allow Symfony 5.0

Author: nicolas-grekas

composer.json

@@ -20,7 +20,7 @@
         "symfony/polyfill-ctype": "~1.8"
     },
     "require-dev": {
-        "symfony/console": "~3.4|~4.0"
+        "symfony/console": "^3.4|^4.0|^5.0"
     },
     "conflict": {
         "symfony/console": "<3.4"