L5.6 版本，找回密码邮件文字修改?

//namespace Illuminate\Auth\Notifications;
//ResetPassword.php

    /**
     * Build the mail representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return \Illuminate\Notifications\Messages\MailMessage
     */
    public function toMail($notifiable)
    {
        if (static::$toMailCallback) {
            return call_user_func(static::$toMailCallback, $notifiable, $this->token);
        }

        return (new MailMessage)
            ->line('You are receiving this email because we received a password reset request for your account.')
            ->action('Reset Password', url(config('app.url').route('password.reset', $this->token, false)))
            ->line('If you did not request a password reset, no further action is required.');
    }

我找到了这个方法，但是我在User模型里怎么样重写，好象都不起作用。要怎么样才可以修改这里的文字？