removes user_permissions as legacy from previous version

Author: denismitr

README.md

@@ -31,7 +31,6 @@ This one insures that user belongs to all required auth groups
 Then run `php artisan migrate` and the following _5_ tables will be created:
 * auth_groups
 * permissions
-* user_permissions
 * auth_group_users
 * auth_group_permissions
 

migrations/create_laravel_permissions.php

@@ -100,7 +100,6 @@ public function up()
     public function down()
     {
         Schema::dropIfExists('auth_group_users');
-        Schema::dropIfExists('user_permissions');
         Schema::dropIfExists('auth_group_permissions');
         Schema::dropIfExists('permissions');
         Schema::dropIfExists('auth_groups');