Revert unnecessary tailwindcss version bump and changed laravel-mix to be the same as in L7 package.json

Author: benvilliere

src/TailwindCssPreset.php

@@ -30,10 +30,10 @@ public static function installAuth()
     protected static function updatePackageArray(array $packages)
     {
         return array_merge([
-            'laravel-mix' => '^5.0',
+            'laravel-mix' => '^5.0.1',
             'laravel-mix-purgecss' => '^4.1',
             'laravel-mix-tailwind' => '^0.1.0',
-            'tailwindcss' => '^1.2',
+            'tailwindcss' => '^1.0',
             '@tailwindcss/custom-forms' => '^0.2',
         ], Arr::except($packages, [
             'bootstrap',