private function registerNoCaptcha()
    {
        $this->singleton(Contracts\NoCaptcha::class, function($app) {
            /** @var  \Illuminate\Config\Repository  $config */
            $config = $app['config'];

            return new NoCaptcha(
                $config->get('no-captcha.secret'),
                $config->get('no-captcha.sitekey'),
                $config->get('no-captcha.lang'),
                $config->get('no-captcha.attributes', [])
            );
        });

        $this->singleton('arcanedev.no-captcha', Contracts\NoCaptcha::class);
    }