Incorrect File.seperator use - broken on Windows.

[nich0s]

On Windows:

[...]
    GET           /v1/openapi/*                [*/*]                     [*/*]                     (OpenAPIService._)    
    GET           /v1/openapi/redoc            [*/*]                     [text/html]               (OpenAPIService._)    
    GET           /v1\openapi.yaml             [*/*]                     [text/yaml]               (OpenAPIService._) 
[...]   

[nich0s]

Howdy - sorry about the terseness of this. I wrote it when I was pre-coffee this morning. The reasoning behind the PR is that it appears that File.seperator is being called and the resulting value is being used to set the path template for YAML lookup. This fails on Windows resulting with the above.

[noboomu]

All good :) Thank you.