Ease restrictions of phpunit dependency to allow ^9.0

Author: Bradie Tilley

README.md

@@ -5,6 +5,8 @@ colour support and better displays of errors and failures.
 
 ![Presenter Output](https://abweb.com.au/img/presenter.png)
 
+**This has _only_ been tested with PHPUnit `^7.5`**. However, this plugin still allows PHPUnit up to `^9.0` (via composer.json) to ease dependency restrictions but please note that things may not work as expected (use at your own 'risk').
+
 ## Features
 
 - Different formatting types depending on your preferences.

composer.json

@@ -23,7 +23,7 @@
     },
     "require": {
         "league/climate": "^3.5",
-        "phpunit/phpunit": "^7.5|^8.0"
+        "phpunit/phpunit": "^7.5|^8.0|^9.0"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "3.*",