Add PHP 8.0 support (#5)

* Update composer.json

added php 8 support

* Update README.md

updated requirements to add php 8 support as well

Author: Pezhvak

README.md

@@ -20,7 +20,7 @@ By installing StageFront with composer, adding the middleware and setting 3 vari
 
 ## ✅ Requirements
 
--   PHP >= 7.1
+-   PHP >= 7.1 | 8.0
 -   [Laravel](https://laravel.com/) >= 5.7
 
 ## 📦 Installation

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": "^7.1",
+        "php": "^7.1|^8.0",
         "codezero/dotenv-updater": "^1.1",
         "illuminate/support": "^5.7|^6.0|^7.0|^8.0"
     },