Add support for PHPUnit 9

Author: kocsismate

CHANGELOG.md

@@ -13,6 +13,7 @@ FIXED:
 ADDED:
 
 - Support for PHP 8
+- Support for PHPUnit 9
 
 ## 0.7.3 - 2020-01-06
 

composer.json

@@ -22,7 +22,7 @@
         "phpstan/phpstan": "^0.12.0",
         "phpstan/phpstan-phpunit": "^0.12.0",
         "phpstan/phpstan-strict-rules": "^0.12.0",
-        "phpunit/phpunit": "^8.4.0",
+        "phpunit/phpunit": "^8.4.0||^9.0.0",
         "squizlabs/php_codesniffer": "^3.5.0",
         "woohoolabs/coding-standard": "^2.1.1",
         "woohoolabs/releaser": "^1.2.0"