Allow Laravel 6

Author: rdarcy1

composer.json

@@ -18,7 +18,7 @@
   ],
   "require": {
     "php": "^5.6 | ^7.0",
-    "laravel/framework": "^5.3",
+    "laravel/framework": "^5.3 | ^6.0",
     "konsulting/laravel-editor-stamps": "^0.1.0"
   },
   "autoload": {