Add Laravel 8 as a dev dependency

Author: ivanvermeyen

composer.json

@@ -19,7 +19,7 @@
         "php": "^7.1"
     },
     "require-dev": {
-        "illuminate/support": "^5.6|^6.0|^7.0",
+        "illuminate/support": "^5.6|^6.0|^7.0|^8.0",
         "phpunit/phpunit": "^7.0|^8.0|^9.0"
     },
     "scripts": {