Bump python-dotenv from 0.15.0 to 0.16.0 (#156)

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 0.15.0 to 0.16.0.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/master/CHANGELOG.md)
- [Commits](theskumar/python-dotenv@v0.15.0...v0.16.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -4,7 +4,7 @@ fastapi==0.63.0
 jinja2==2.11.3
 pathvalidate==2.4.0
 pillow==8.1.2
-python-dotenv==0.15.0
+python-dotenv==0.16.0
 python-multipart==0.0.5
 typing_extensions==3.7.4.3
 uvicorn[standard]==0.13.4