public function update(Request $request, $id)
    {
        $request->validate([
            'first_name'=>'required',
            'last_name'=>'required',
            'email'=>'required'
        ]);
        $contact = Contact::find($id);
        $contact->first_name =  $request->get('first_name');
        $contact->last_name = $request->get('last_name');
        $contact->email = $request->get('email');
        $contact->job_title = $request->get('job_title');
        $contact->city = $request->get('city');
        $contact->country = $request->get('country');
        $contact->save();
        return redirect('/contacts')->with('success', 'Contact updated!');
    }