Fixed PHP 8 support.

Author: olsgreen

composer.json

@@ -12,15 +12,15 @@
     "prefer-stable": true,
     "require": {
         "php": "^7.2.5|^8.0",
-        "illuminate/contracts": "~6.15.1",
-        "illuminate/http": "~6.15.1",
-        "illuminate/database": "~6.15.1",
-        "illuminate/auth": "~6.15.1",
-        "illuminate/routing": "~6.15.1",
-        "illuminate/notifications": "~6.15.1",
-        "illuminate/bus": "~6.15.1",
-        "illuminate/cookie": "~6.15.1",
-        "illuminate/encryption": "~6.15.1",
+        "illuminate/contracts": "^6.20",
+        "illuminate/http": "^6.20",
+        "illuminate/database": "^6.20",
+        "illuminate/auth": "^6.20",
+        "illuminate/routing": "^6.20",
+        "illuminate/notifications": "^6.20",
+        "illuminate/bus": "^6.20",
+        "illuminate/cookie": "^6.20",
+        "illuminate/encryption": "^6.20",
         "ua-parser/uap-php": "^3.8"
     },
     "require-dev": {