public function atualizar()
 {
     try {
         $validacao = Marca::validar(request()->all());
         if ($validacao->fails()) {
             return redirect()->route('marca.editar', ['id' => request()->get('id')])->withErrors($validacao)->withInput();
         }
         Marca::atualizar(request());
         return redirect()->route('marca.index');
     } catch (\Exception $e) {
         return $e->getMessage();
     }
 }