Initial Update

[pyup-bot]

This PR sets up pyup.io on this repo and updates all dependencies at once, in a single branch.

Subsequent pull requests will update one dependency at a time, each in their own branch. If you want to start with that right away, simply close this PR.

Update pytest from 4.6.9 to 5.3.5.

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

Links

- PyPI: https://pypi.org/project/pytest - Homepage: https://docs.pytest.org/en/latest/

Update twine from 1.15.0 to 3.1.1.

Changelog

### 3.1.1 ``` * :bug:`548` Restore ``--non-interactive`` as a flag not expecting an argument. ``` ### 3.1.0 ``` * :feature:`547` Add support for specifying ``--non-interactive`` as an environment variable. ``` ### 3.0.0 ``` * :feature:`336` When a client certificate is indicated, all password processing is disabled. * :feature:`489` Add ``--non-interactive`` flag to abort upload rather than interactively prompt if credentials are missing. * :feature:`524` Twine now unconditionally requires the keyring library and no longer supports uninstalling ``keyring`` as a means to disable that functionality. Instead, use ``keyring --disable`` keyring functionality if necessary. * :feature:`518` Add Python 3.8 to classifiers. * :bug:`332 major` More robust handling of server response in ``--skip-existing`` ``` ### 2.0.0 ``` * :feature:`437` Twine now requires Python 3.6 or later. Use pip 9 or pin to "twine<2" to install twine on older Python versions. * :bug:`491 major` Require requests 2.20 or later to avoid reported security vulnerabilities in earlier releases. ```

Links

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

[welcome[bot]]

🍻 Thanks for opening this pull request, you're awesome! 😃

[renemarc]

Closing this PR since requirements are now in setup.py and no longer in requirements.txt