Update flask-cors to 3.0.7

Created by: pyup-bot

This PR updates Flask-Cors from 3.0.6 to 3.0.7.

Changelog

3.0.7

Updated logging.warn to logging.warning (234) Thanks Vaibhav

Links

• PyPI: https://pypi.org/project/flask-cors
• Changelog: https://pyup.io/changelogs/flask-cors/
• Repo: https://github.com/corydolphin/flask-cors