Updated infection, allowed PHP8

Author: everon

composer.json

@@ -18,7 +18,7 @@
     }
   },
   "require": {
-    "php": "^7.2",
+    "php": "^7.2|^8.0",
     "phpunit/phpunit": "^8.0",
     "jakub-onderka/php-console-highlighter": "^0.3.2",
     "edmondscommerce/php-parallel-lint": "~1.0.1",
@@ -28,7 +28,7 @@
     "squizlabs/php_codesniffer": "~3",
     "sllh/composer-versions-check": "^2.0",
     "phpstan/phpstan-strict-rules": "^0.12",
-    "infection/infection": "^0.10",
+    "infection/infection": "^0.10|^0.20",
     "funkyproject/reflection-file": "^0.1.0",
     "phpunit/php-invoker": "^2.0",
     "maglnet/composer-require-checker": "^2.0",