Update UPGRADE.md

Author: taylorotwell

UPGRADE.md

@@ -4,9 +4,9 @@
 
 ### PHPUnit 8
 
-Dusk now provides support for PHPUnit 8. If you wish to make use of PHPUnit 8 the minimum requirement is PHP 7.2. Please read through the entire list of changes in [the PHPUnit 8 release announcement](https://phpunit.de/announcements/phpunit-8.html). Using PHPUnit 8 will require Laravel 5.8 which will be released at the end of February 2019.
+Dusk now provides optional support for PHPUnit 8, which requires PHP >= 7.2 Please read through the entire list of changes in [the PHPUnit 8 release announcement](https://phpunit.de/announcements/phpunit-8.html). Using PHPUnit 8 will require Laravel 5.8, which will be released at the end of February 2019.
 
-You may also choose to continue to use PHPUnit 7 which requires a minimum of PHP 7.1.
+You may also continue using PHPUnit 7, which requires a minimum of PHP 7.1.
 
 ### Minimum Laravel version