Add Laravel 6.x support

Author: jkudish

composer.json

@@ -15,7 +15,7 @@
         }
     },
     "require": {
-        "illuminate/support": "5.3.*||5.4.*||5.5.*||5.6.*||5.7.*||5.8.*"
+        "illuminate/support": "5.3.*||5.4.*||5.5.*||5.6.*||5.7.*||5.8.*||^6.0"
     },
     "extra": {
         "laravel": {