Update twine to 1.12.0

[pyup-bot]

This PR updates twine from 1.11.0 to 1.12.0.

Changelog

1.12.0

* :feature:`395 major` Add ``twine check`` command to check long description
* :feature:`392 major` Drop support for Python 3.3
* :feature:`363` Empower ``--skip-existing`` for Artifactory repositories
* :bug:`367` Avoid MD5 when Python is compiled in FIPS mode

Links

• PyPI: https://pypi.org/project/twine
• Changelog: https://pyup.io/changelogs/twine/
• Docs: https://twine.readthedocs.io/

[coveralls]

Pull Request Test Coverage Report for Build 180

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 97.674%

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Totals
Change from base Build 174:	-0.04%
Covered Lines:	126
Relevant Lines:	129

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 183

• 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 97.674%

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Totals
Change from base Build 181:	0.0%
Covered Lines:	126
Relevant Lines:	129

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💛 - Coveralls