Remove support for Laravel 6.0 & 7.0

Author: aalbarca

composer.json

@@ -20,8 +20,8 @@
     ],
     "require": {
         "php": ">=7.4",
-        "illuminate/notifications": "~6.0 || ~7.0 || ~8.0",
-        "illuminate/support": "~6.0 || ~7.0 || ~8.0",
+        "illuminate/notifications": "~8.0 || ~9.0",
+        "illuminate/support": "~8.0 || ~9.0",
         "netflie/whatsapp-cloud-api": "^1.3.1"
     },
     "require-dev": {