Added support in composer.json to PHP 7.2

Author: boris-burgos

composer.json

@@ -8,7 +8,7 @@
         "Disable Newsletter Magento 2"
     ],
     "require": {
-        "php": "~5.5.0|~5.6.0|~7.0.0|~7.1.0"
+        "php": "~5.5.0|~5.6.0|~7.0.0|~7.1.0|~7.2.0"
     },
     "type": "magento2-module",
     "version": "1.0.0",