Inheritance: extends Illuminate\Foundation\Http\FormRequest
 /**
  * Update the specified resource in storage.
  *
  * @param \App\Http\Requests\TaxClassRequest $request
  * @param int                                $id
  *
  * @return \Illuminate\Http\Response
  */
 public function update(TaxClassRequest $request, $id)
 {
     $taxClass = TaxClass::findorfail($id);
     $taxClass->update($request->all());
     return redirect()->route('admin.tax-class.index');
 }