title: CakePHP Migration Script doesn't update the Table Model
body: <p>I need to add an admin column to my user table in my database. I created the migration script with the following command.</p>
  
  <pre><code>bin/cake bake migration AddAdminToUsers admin:boolean
  </code></pre>
  
  <p>This mostly did what I wanted, I just changed the default value to <code>false</code>. My Migration script now looks like this.</p>
  
  <pre><code>&lt;?php
  use Migrations\AbstractMigration;
  
  class AddAdminToUsers extends AbstractMigration
  {
      public function change()
      {
          $table = $this-&gt;table('users');
          $table-&gt;addColumn('admin', 'boolean', [
              'default' =&gt; false,
              'null' =&gt; false
          ]);
          $table-&gt;update();
      }
  }
  </code></pre>
  
  <p>Also, oddly enough, I've tried this several times and each time I'm only able to run this migration script once. I have to delete it and re-bake a new one if I want another one to work.</p>