title: How to update field when delete a row in laravel
body: <p>Let I have a table named <code>customer</code> where customer table has a field named <code>deleted_by</code>. 
  I implement <code>softDelete</code> in <code>customer</code> model. Now I want to update <code>deleted_by</code> when row delete. So that I can trace who delete this row.</p>
  
  <p>I do search on google about it But I don't found anything.</p>
  
  <p>I use laravel 4.2.8 &amp; Eloquent</p>