title: Laravel Excel chunk + noHeading not working together
body: <p>I'm working with large excel-files (~160k rows) which are loaded in with phpexcel using maatwesite-excel (laravel excel).</p>
  
  <p>Although when using 'chunk' I can't access 'noHeading()'.</p>
  
  <pre><code>Excel::filter('chunk')-&gt;load($pricefile-&gt;real_path)-&gt;chunk(250, function($reader)    {
      $reader = $reader-&gt;noHeading(); //Error: Method noHeading does not exist.
  }
  
  Excel::load($pricefile-&gt;real_path, function($reader){ 
      $reader = $reader-&gt;noHeading(); //array(0 =&gt; 'value', [...])
  }
  </code></pre>
  
  <p>Any Ideas? </p>