The library now fully supports PHP 8.0 and min PHP version now bumped…

… to PHP 7.3+,. Updated docblocks where was previously using my previous GitHub username. phpunit test cases and xml manifest now fully compatible with PHPUnit 9. README file explains how to install older versions of this lib to support older PHP versions.

README.md

@@ -33,7 +33,7 @@ The recommended way of installing this library is via. [Composer](http://getcomp
 composer require ballen/linguist
 ```
 
-*If you need to use an older version of PHP, version 1.x.x supports PHP 5.6, 7.0, 7.1 and 7.2, you can install this version using Composer with this command instead:**
+**If you need to use an older version of PHP, version 1.x.x supports PHP 5.6, 7.0, 7.1 and 7.2, you can install this version using Composer with this command instead:**
 
 ```shell
 composer require ballen/linguist ^1.0