Update PHP version for 8.0 / 8.1 (#81)

* Update PHP version compatibility

* Fix php composer dependency

Author: chrisdicarlo

composer.json

@@ -16,7 +16,7 @@
     }
     ],
     "require": {
-        "php": "^7.3",
+        "php": "^7.3|^8.0",
         "illuminate/database": "^8.0"
     },
     "require-dev": {