Make the bundle usable with Symfony 2.8+

Author: bytehead

composer.json

@@ -4,7 +4,7 @@
     "type": "symfony-bundle",
     "require": {
         "contao/core-bundle": "^4.2",
-        "symfony/console": "^3.1"
+        "symfony/console": "^2.8"
     },
     "autoload": {
         "psr-4": {