Update safety to 1.9.0

[pyup-bot]

This PR updates safety from 1.8.7 to 1.9.0.

Changelog

1.9.0

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* Dropped Python 2.7 support, requiring Python 3.5+
* Binary adjustments and enhancements on top of reported vulnerability
* Using tox to help with local tests against different Python versions

Links

• PyPI: https://pypi.org/project/safety
• Changelog: https://pyup.io/changelogs/safety/
• Repo: https://github.com/pyupio/safety

[coveralls]

Pull Request Test Coverage Report for Build 686

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 683:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls