Merge pull request #94 from clue-labs/phpunit8-v3

[3.x] Update test environment to fix tests on legacy PHP 7.2 with PHPUnit 8.5

Author: WyriHaximus

composer.json

@@ -32,7 +32,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "1.10.39 || 1.4.10",
-        "phpunit/phpunit": "^9.6 || ^7.5"
+        "phpunit/phpunit": "^9.6 || ^8.5 || ^7.5"
     },
     "autoload": {
         "files": [