Support more versions of marc-mabe/php-enum

Author: marc-mabe

composer.json

@@ -37,7 +37,7 @@
     }],
     "require": {
         "php": ">=5.3.3",
-        "marc-mabe/php-enum":"2.3.1"
+        "marc-mabe/php-enum":"^2.0 || ^3.0"
     },
     "require-dev": {
         "json-schema/JSON-Schema-Test-Suite": "1.2.0",