Update composer.json

Author: jason-nabooki

composer.json

@@ -10,7 +10,7 @@
     ],
     "require": {
         "php": ">=5.4.0",
-        "illuminate/support": "~5|~6",
+        "illuminate/support": "~5|~6|~7",
         "omnipay/common": "~3.0",
         "php-http/guzzle6-adapter": "^1.1|^2"
     },