routing should be in routes/web.php for generated Lumen server stub

Description

routing should be in routes/web.php for generated Lumen server stub ever since Lumen 5.3+.
The generated Lumen server stub put all routing in lib\app\Http\routes.php.
This works only for Lumen 5.2 and older version. Please refer to:
https://lumen.laravel.com/docs/5.2/routing#basic-routing

Swagger-codegen version

2.3.1

Swagger declaration file content or url

any API doc in yaml/json format, including default PetStore example.

Command line used for generation

Using codegen functionality integrated in swagger-editor. But I don't think it's related with specific cmd line options a.f.a.i.k.

Steps to reproduce

Select generate server->Lumen in swagger-editor menu.

Related issues/PRs

Suggest a fix/enhancement

Ever since Lumen 5.3+ (my framework: Lumen 5.5), the routing has been moved to routes\web.php.
And with this directory structure changes, current generated server stub code would cause error 404
due to syntactic error in routes.php.
Please refer to:
https://lumen.laravel.com/docs/5.3/routing#basic-routing

Inspect the generated Lumen server stub's lib/app/Http/routes.php and the routes/web.php location described in the issue. Generate a server from the default PetStore YAML, verify the routing placement for Lumen 5.5, and confirm the generated application no longer produces a 404 from the misplaced routes.