laravel 9 support (#21)

Co-authored-by: Wojciech Górczak <[email protected]>

Author: gorczakw

composer.json

@@ -13,8 +13,8 @@
     ],
     "require": {
         "php": ">=7.2",
-        "illuminate/notifications": "~6.0 || ~7.0 || ~8.0",
-        "illuminate/support": "~6.0 || ~7.0 || ~8.0",
+        "illuminate/notifications": "~6.0 || ~7.0 || ~8.0 || ~9.0",
+        "illuminate/support": "~6.0 || ~7.0 || ~8.0 || ~9.0",
         "smsapi/php-client": "^1.8"
     },
     "require-dev": {