update readme for 6.0

Author: michaeldyrynda

README.md

@@ -1,11 +1,11 @@
-# Laravel 5.7+ Frontend preset for Tailwind CSS
+# Laravel 6.0+ Frontend preset for Tailwind CSS
 
 A Laravel front-end scaffolding preset for [Tailwind CSS](https://tailwindcss.com) - a Utility-First CSS Framework for Rapid UI Development.
 
 ## Usage
 
-1. Fresh install Laravel >= 5.7.0 and cd to your app.
-2. Install this preset via `composer require laravel-frontend-presets/tailwindcss --dev`. Laravel will automatically discover this package. No need to register the service provider.
+1. Fresh install Laravel >= 6.0 and cd to your app.
+2. Install this preset via `composer require --dev laravel-frontend-presets/tailwindcss --dev`. Laravel will automatically discover this package. No need to register the service provider.
 
 ### For Presets without Authentication