Update coveralls to 3.3.1

[pyup-bot]

This PR updates coveralls from 3.2.0 to 3.3.1.

Changelog

3.3.1

Bug Fixes

* correctly support parallel execution on CircleCI (336) ([2610885a](2610885a))

Internal

* exclude a few incompatible `coverage` versions (337)

`coverage` versions v6.0.0 through v6.1.1 exhibited some incompatibilies with
`coveralls`; we've updated our version compatibility ranges to exclude those
versions.

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3.3.0

Features

* **cli:**  add --srcdir option (306) ([4120c540](4120c540))
* **deps:**  add support for coverage v6.x (330) ([372443dc](372443dc), closes [326](326))

Note this implicitly improves support for Python 3.10, as coverage v6.x includes some fixes for v3.10 of Python.

Bug Fixes

* **env:**  fixup handling of default env service values (314) ([1a0fd9b3](1a0fd9b3), closes [303](303))

This solves some edge cases around duplicated / unmerged coverage results in parallel runs.

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Links

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