Allow Symfony 5.x

Author: yann-eugone

composer.json

@@ -12,7 +12,7 @@
   ],
   "require": {
     "php": "^7.2",
-    "symfony/validator": "^4.4",
+    "symfony/validator": "^4.4|^5.0",
     "yokai/batch": "self.version"
   },
   "autoload": {