Inheritance: extends App\Http\Requests\TaxRateRequest
 public function update(UpdateTaxRateRequest $request, $publicId)
 {
     $taxRate = TaxRate::scope($publicId)->firstOrFail();
     $this->taxRateRepo->save($request->input(), $taxRate);
     Session::flash('message', trans('texts.updated_tax_rate'));
     return Redirect::to('settings/' . ACCOUNT_TAX_RATES);
 }