Remove wrong copyright blocks [skip ci]

database/migrations/2016_09_12_121359_fix_nullables.php

@@ -1,13 +1,4 @@
 <?php
-/**
- * 2016_09_12_121359_fix_nullables.php
- * Copyright (C) 2016 https://github.com/sandermulders
- *
- * This software may be modified and distributed under the terms of the
- * Creative Commons Attribution-ShareAlike 4.0 International License.
- *
- * See the LICENSE file for details.
- */
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;