title: Export RawQuerySet to excel with ExcelResponse. Error "ExcelResponse requires a sequence of sequences"
body: <p>I try to download a view postgres to excel, it is possible with ExcelResponse ?</p>
  
  <pre><code>from excel_response import ExcelResponse
  def vw_export_to_Excel(request):
      data = _Custumer.objects.raw('''select * from vw_customer''')
      return ExcelResponse(data, 'customer')
  </code></pre>