Update python-json-logger to 0.1.11

[pyup-bot]

This PR updates python-json-logger from 0.1.10 to 0.1.11.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/python-json-logger
• Changelog: https://pyup.io/changelogs/python-json-logger/
• Repo: http://github.com/madzak/python-json-logger