middleware on routes delete api info for swagger

I simply tried to add 

```
(PUT* "/my/route" []
    :return mySchema
    :body [param (describe paramSchema "my param")]
    :middlewares [identity]
    (ok "done"))
```

in my route declaration, the middlewares appears to work, but the YAML generated for the api-docs occurs as if there were no schema provided. So the swagger ui don't show any more input fields.
