Added support for Laravel 7

Author: chinleung

composer.json

@@ -23,7 +23,7 @@
         "php": "^7.2",
         "browserstack/browserstack-local": "^1.1",
         "guzzlehttp/guzzle": "^6.5",
-        "illuminate/support": "~5.8.0|^6.0",
+        "illuminate/support": "~5.8.0|^6.0|^7.0",
         "laravel/dusk": "^5.9"
     },
     "require-dev": {