Add urls with versioning

[tommy04062019]

Is your feature request related to a problem? Please describe. Without versioning:

app = FastAPI(title=TITLE,
              servers=[
                  {"url": "http://localhost:8081", "description": "Dev environment"},
                  {"url": "https://prod.example.com", "description": "Production environment"},
              ],
              description=DESCRIPTION,
              version=VERSION,
              contact=CONTACTS,
              license_info=LICENSE

              )

Describe the solution you'd like

• Add an option to use with versioning ,so in the docs will show the servers section with abover servers list.