minimum support for laravel 6

Author: jericoffeo

composer.json

@@ -47,7 +47,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "~6.0",
-        "laravel/laravel": "^5.5",
+        "laravel/laravel": "^6|^7",
         "orchestra/testbench": "^4.0"
     }
 }