Support ~7.3.0

Author: nuovecode

composer.json

@@ -13,7 +13,7 @@
         "source": "https://github.com/splashlab/magento-2-cors-requests"
     },
     "require": {
-        "php": "7.0.2|7.0.4|~7.0.6|~7.1.0|~7.2.0",
+        "php": "7.0.2|7.0.4|~7.0.6|~7.1.0|~7.2.0|~7.3.0",
         "magento/framework": "*"
     },
     "autoload": {