[REQ] Add support for Swashbuckle 5.0.0 in aspdotnetcore

Created by: theletterf

Is your feature request related to a problem? Please describe.

Swashbuckle 5.0.0 is about to go live. The current aspdotnetcore generator uses v3 though.

https://github.com/domaindrivendev/Swashbuckle.AspNetCore/blob/master/README-v5.md

Describe the solution you'd like

The aspnetcore generator should support v5 of Swashbuckle upon release. The RC2 is already out.