public function edit($id)
    {
        $authors = Author::findOrFail($id);
        return view('backend.authors.form', compact('authors'));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        $this->validate($request, [
            'name' => 'required|string'
        ]);
        $authors = Author::findOrFail($id);
        $authors->update($request->all());
        return $authors;
    }