Update composer.json

Author: imanghafoori1

composer.json

@@ -12,7 +12,7 @@
     ],
     "require": {
         "php": "^7.1.3|7.2.*|7.3.*|7.4.*",
-        "laravel/framework":"~5.1|6.*|7.*"
+        "laravel/framework":"~5.1|6.*|7.*|8.*"
     },
     "autoload-dev": {
         "classmap": ["tests/TestCase.php"]