Advertise Laravel 8 support

Author: GrahamCampbell

README.md

@@ -11,7 +11,7 @@
 
 ## Installation
 
-Alt Three TestBench provides some testing traits for Laravel apps. This version requires [PHP](https://php.net) 7.0-8.0, and supports [PHPUnit](https://phpunit.de/) 6-9 and Laravel 5.5-7. Simply require the package using [Composer](https://getcomposer.org):
+Alt Three TestBench provides some testing traits for Laravel apps. This version requires [PHP](https://php.net) 7.0-8.0, and supports [PHPUnit](https://phpunit.de/) 6-9 and Laravel 5.5-8. Simply require the package using [Composer](https://getcomposer.org):
 
 ```bash
 $ composer require alt-three/testbench:^4.2 --dev

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": "^7.0 || ^8.0",
-        "graham-campbell/testbench-core": "^3.1"
+        "graham-campbell/testbench-core": "^3.2"
     },
     "require-dev": {
         "graham-campbell/analyzer": "^2.4 || ^3.0",