⬆️ Allow php 8 (#6)

Author: DanielGSoftware

composer.json

@@ -2,7 +2,7 @@
     "name": "postbode/postbode-api",
     "description": "Official supported client for Postbode.nu (https://postbode.nu)",
     "require": {
-        "php": "~7.0",
+        "php": "^7.0 | ^8.0",
         "guzzlehttp/guzzle": "~6.0|^7.0.1"
     },
     "license": "MIT",