Merge pull request #50 from tweis/task-declare-php-8-compatibility

TASK: Declare compatibility to PHP 8.0

Author: daniellienert

composer.json

@@ -4,7 +4,7 @@
     "description": "Common functionality for a JobQueue in Flow applications.",
     "license": "MIT",
     "require": {
-        "php": "^7.1",
+        "php": "^7.1 || ^8.0",
         "neos/flow": "^4.0 || ^5.0 || ^6.0 || ^7.0 || dev-master",
         "neos/cache": "*"
     },