php8 (#5)

* Allow use of PHP8

* Update version constraint

Co-authored-by: dpi <pro@danielph.in>

Author: kimpepper

composer.json

@@ -9,7 +9,7 @@
     }
   ],
   "require": {
-    "php": "^7.2",
+    "php": "^7.2||^8.0",
     "ext-json": "*",
     "symfony/property-access": "^3.4||^4.4||^5.0",
     "symfony/serializer": "^3.4||^4.4||^5.0"