add support php 8.0

Author: P-Shakibafar

composer.json

@@ -8,7 +8,7 @@
         }
     ],
     "require": {
-        "php" : "^5.6|^7.0",
+        "php" : "^5.6|^7.0|^8.0",
         "illuminate/support": "^5.1|^6.0|^7.0|^8.0"
     },
     "autoload" : {