Update boto3 to 1.9.31

[pyup-bot]

This PR updates boto3 from 1.9.30 to 1.9.31.

Changelog

1.9.31

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* api-change:``codestar``: [``botocore``] Update codestar client to latest version
* api-change:``alexaforbusiness``: [``botocore``] Update alexaforbusiness client to latest version

Links

• PyPI: https://pypi.org/project/boto3
• Changelog: https://pyup.io/changelogs/boto3/
• Repo: https://github.com/boto/boto3

[coveralls]

Pull Request Test Coverage Report for Build 115

• 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 45.846%

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Totals
Change from base Build 110:	0.0%
Covered Lines:	298
Relevant Lines:	650

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #89