问注册器中的Laravel recaptcha验证不起作用

EN

$rules = array(
        // ...
        'g-recaptcha-response' => 'required|recaptcha',
    };

<?php namespace taxman\Services;

use taxman\User;
use Validator;
use Illuminate\Contracts\Auth\Registrar as RegistrarContract;

class Registrar implements RegistrarContract {

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    public function validator(array $data)
    {
        return Validator::make($data, [
            'name' => 'required|max:255',
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|confirmed|min:4',
            'telephone' => 'required',
            'g-recaptcha-response' => 'required|recaptcha',
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return User
     */
    public function create(array $data)
    {
        return User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
        ]);
    }

}

<div class="form-group">
         {!! Recaptcha::render() !!}
 </div>