fix style

database/migrations/2019_02_11_140657_add_is_admin_to_users.php

@@ -1,8 +1,8 @@
 <?php
 
-use Illuminate\Support\Facades\Schema;
-use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
 
 class AddIsAdminToUsers extends Migration
 {