add laravel 8 support

Author: SudoGetBeer

composer.json

@@ -12,9 +12,9 @@
         }
     ],
     "require": {
-        "illuminate/notifications": "^5.5 || ^6.0 || ^7.0",
-        "illuminate/support": "^5.5 || ^6.0 || ^7.0",
-        "illuminate/queue": "^5.5 || ^6.0 || ^7.0",
+        "illuminate/notifications": "^5.5 || ^6.0 || ^7.0 || ^8.0",
+        "illuminate/support": "^5.5 || ^6.0 || ^7.0 || ^8.0",
+        "illuminate/queue": "^5.5 || ^6.0 || ^7.0 || ^8.0",
         "guzzlehttp/guzzle": "^6.2 || ^7.0",
         "ext-json": "*"
     },
@@ -36,10 +36,7 @@
         "test": "vendor/bin/phpunit"
     },
     "config": {
-        "sort-packages": true,
-        "platform": {
-            "php": "7.2.5"
-        }
+        "sort-packages": true
     },
     "minimum-stability": "dev",
     "extra": {