feat: added php 8 compatibility

Author: joaovdiasb

README.md

@@ -25,7 +25,7 @@ php artisan vendor:publish --provider="Joaovdiasb\LaravelPdfManager\LaravelPdfMa
                 ->setFooter('DOCUMENT FOOTER')
                 ->setBody(str_repeat('<u>[NAME]</u><br />', 100))
                 ->setData(['[NAME]' => 'Jhon Doe'])
-                ->setPageCounter(10, 10)
+                ->setPageCounter()
                 ->save('documents');
 ```
 

composer.json

@@ -18,7 +18,7 @@
     "minimum-stability": "dev",
     "prefer-stable":true,
     "require": {
-        "php": "^7.4",
+        "php": "^7.4|^8.0",
         "barryvdh/laravel-dompdf": "^2.0"
     },
     "require-dev": {