Sunset.py Warning Message with curl command

[Charlie Moon]

https://chaostoolkit.org/reference/tutorial/#start-the-application

When running the curl -k https://localhost:8443/city/Paris command in a separate terminal window, the terminal running the sunset.py service issues the following warning message:

SubjectAltNameWarning: Certificate for localhost has no subjectAltName, falling back to check for a commonName for now.
This feature is being removed by major browsers and deprecated by RFC 2818. (See urllib3/urllib3#497 for details.)