update readme to show 5.5/5.6 support, ensure bootstrap 4.0 is removed (Laravel 5.6)

Author: michaeldyrynda

README.md

@@ -1,13 +1,13 @@
-# Laravel 5.5.x Frontend preset for Tailwind CSS
+# Laravel 5.5.x/5.6.x 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.
 
-*Current version:* **Tailwind CSS 0.4.0**
+*Current version:* **Tailwind CSS 0.4.1**
 
 ## Usage
 
-1. Fresh install Laravel 5.5.x and cd to your app.
-2. Install this preset via `composer require laravel-frontend-presets/tailwindcss`. Laravel 5.5.x will automatically discover this package. No need to register the service provider.
+1. Fresh install Laravel 5.5.x or 5.6.x and cd to your app.
+2. Install this preset via `composer require laravel-frontend-presets/tailwindcss`. Laravel >= 5.5.0 will automatically discover this package. No need to register the service provider.
 3. Use `php artisan preset tailwindcss` for the basic Tailwind CSS preset OR use `php artisan preset tailwindcss-auth` for the basic preset, auth route entry and Tailwind CSS auth views in one go. (NOTE: If you run this command several times, be sure to clean up the duplicate Auth entries in `routes/web.php`)
 4. `npm install`
 5. `npm run dev`

src/TailwindCssPreset.php

@@ -30,7 +30,7 @@ protected static function updatePackageArray(array $packages)
             'tailwindcss' => '^0.4.0',
             'glob-all' => '*',
             'purgecss-webpack-plugin' => '*'
-        ] + Arr::except($packages, ['bootstrap-sass', 'jquery']);
+        ] + Arr::except($packages, ['bootstrap', 'bootstrap-sass', 'jquery']);
     }
 
     protected static function updateStyles()