Enable PHP 7.1 support

Author: avoelkl

composer.json

@@ -8,7 +8,7 @@
         "Disable Newsletter Magento 2"
     ],
     "require": {
-        "php": "~5.5.0|~5.6.0|~7.0.0"
+        "php": "~5.5.0|~5.6.0|~7.0.0|~7.1.0"
     },
     "type": "magento2-module",
     "version": "1.0.0",
@@ -31,4 +31,4 @@
             "Codeko\\DisableNewsletter\\": ""
         }
     }
-}
+}