title: Group by not working after upgrading to laravel 5.3
body: <p>This is the code that was working on laravel 5.2</p>
  
  <pre><code>$menus = CmsMenuItem::groupBy('menu_id')-&gt;get();
  </code></pre>
  
  <p>but now it throws error</p>
  
  <blockquote>
    <p>SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1
    of SELECT list is not in GROUP BY clause and contains nonaggregated
    column 'convertifier_cms.cms_menu_items.id' which is not functionally
    dependent on columns in GROUP BY clause; this is incompatible with
    sql_mode=only_full_group_by (SQL: select * from 'cms_menu_items' group
    by 'menu_id')</p>
  </blockquote>
  
  <p>I have also tried</p>
  
  <pre><code> `strict =&gt; false` 
  </code></pre>
  
  <p>in database.php but no effect</p>