public function register()
    {
        $this->app->register(\Laravel\Passport\PassportServiceProvider::class);
        $this->app->register(\Railken\Amethyst\Providers\ApiServiceProvider::class);
        $this->app->register(\Railken\Amethyst\Providers\UserServiceProvider::class);
        $this->mergeConfigFrom(__DIR__.'/../../config/amethyst.authentication.php', 'amethyst.authentication');
    }