Add Laravel 6 support

README.md

@@ -2,9 +2,9 @@
 
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+[![StyleCI](https://styleci.io/repos/75414626/shield?branch=6.x&style=flat)](https://styleci.io/repos/75414626)
+[![Build Status](https://travis-ci.org/dmitry-ivanov/laravel-testing-tools.svg?branch=6.x)](https://travis-ci.org/dmitry-ivanov/laravel-testing-tools)
+[![Coverage Status](https://coveralls.io/repos/github/dmitry-ivanov/laravel-testing-tools/badge.svg?branch=6.x)](https://coveralls.io/github/dmitry-ivanov/laravel-testing-tools?branch=6.x)
 
 [![Latest Stable Version](https://poser.pugx.org/illuminated/testing-tools/v/stable)](https://packagist.org/packages/illuminated/testing-tools)
 [![Latest Unstable Version](https://poser.pugx.org/illuminated/testing-tools/v/unstable)](https://packagist.org/packages/illuminated/testing-tools)
@@ -30,7 +30,7 @@ Laravel-specific testing helpers and asserts.
 1. Install the package via Composer:
 
     ```shell
-    composer require --dev illuminated/testing-tools
+    composer require --dev "illuminated/testing-tools:^6.0"
     ```
 
 2. Use `Illuminated\Testing\TestingTools` and disable `$mockConsoleOutput`: