public function getAllRequestsToExcel()
 {
     $requests = \App\Request::select('id', 'first_name', 'last_name', 'description', 'created_at')->get();
     Excel::create('requests', function ($excel) use($requests) {
         $excel->sheet('Sheet 1', function ($sheet) use($requests) {
             $sheet->fromArray($requests);
         });
     })->export('xls');
 }