title: Changing column in Laravel migration causes exception: Changing columns for table requires Doctrine DBAL
body: <p>I'm trying to change the max length of one of my columns in table <code>reserves</code> in one migration. The code looks like this:</p>
  
  <pre><code>public function up()
  {
      //
      Schema::table('reserves', function($table){
          $table-&gt;string("mobile", 11)-&gt;change();
      });
  }
  </code></pre>
  
  <p>But when running the migration via artisan, it throws an exception and says:</p>
  
  <blockquote>
    <p>[RuntimeException] Changing columns for table "reserves" requires
    Doctrine DBAL; install "doctrine/dbal".</p>
  </blockquote>
  
  <p>What is the problem and how can I solve it?</p>