Added alternative symfony/console versions (~3.0 and ~4.0).

Author: corpsee

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "php": ">=5.3.3",
         "guzzle/guzzle": "~3.7",
-        "symfony/console": "~2.5"
+        "symfony/console": "~2.5|~3.0|~4.0"
     },
     "require-dev":{
         "phpunit/phpunit": "~4.1"