Update coveralls to 2.1.0

[pyup-bot]

This PR updates coveralls from 1.11.1 to 2.1.0.

Changelog

2.1.0

Features

* **cli**:  add new `--finish` flag for finalizing parallel builds (277) ([f597109b](f597109b))

Bug Fixes

* **github:**  fix Github Actions support (227) ([f597109b](f597109b))

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2.0.0

Compatiblity (BREAKING CHANGES)

*  We have now dropped support for End-Of-Life'd versions of Python and
particularly old versions of the `coverage` library; if you are still using
Python v2.7 or v3.4, or you are using `coverage<4.1`, this library will no
longer be compatible starting from this release -- please pin to
`coveralls<2.0.0`.

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Links

• PyPI: https://pypi.org/project/coveralls
• Changelog: https://pyup.io/changelogs/coveralls/
• Repo: http://github.com/coveralls-clients/coveralls-python

[coveralls]

Coverage remained the same at 14.329% when pulling b667439 on pyup-update-coveralls-1.11.1-to-2.1.0 into c60020b on master.

[pyup-bot]

Closing this in favor of #324