Merge pull request #27 from patchlevel/php8-support

add php8 support

Author: DanielBadura

.github/workflows/phpunit.yml

@@ -22,6 +22,7 @@ jobs:
                     - "locked"
                 php-version:
                     - "7.4"
+                    - "8.0"
                 operating-system:
                     - "ubuntu-latest"
                     - "windows-latest"

composer.json

@@ -18,16 +18,16 @@
         }
     ],
     "require": {
-        "php": "^7.4",
-        "ext-json": "^7.4"
+        "php": "^7.4|^8.0",
+        "ext-json": "^7.4|^8.0"
     },
     "require-dev": {
-        "infection/infection": "^0.20.1",
+        "infection/infection": "^0.20.2",
         "patchlevel/coding-standard": "^1.0.0",
-        "phpstan/phpstan": "^0.12.56",
-        "phpunit/phpunit": "^9.4.3",
-        "symfony/var-dumper": "^5.1",
-        "vimeo/psalm": "^4.1.1"
+        "phpstan/phpstan": "^0.12.58",
+        "phpunit/phpunit": "^9.4.4",
+        "symfony/var-dumper": "^5.2.0",
+        "vimeo/psalm": "^4.3.1"
     },
     "config": {
         "preferred-install": {