Update coverage to 5.4

[pyup-bot]

This PR updates coverage from 5.3.1 to 5.4.

Changelog

### 5.4 ``` -------------------------- - The text report produced by ``coverage report`` now always outputs a TOTAL line, even if only one Python file is reported. This makes regex parsing of the output easier. Thanks, Judson Neer. This had been requested a number of times (`issue 1086`_, `issue 922`_, `issue 732`_). - The ``skip_covered`` and ``skip_empty`` settings in the configuration file can now be specified in the ``[html]`` section, so that text reports and HTML reports can use separate settings. The HTML report will still use the ``[report]`` settings if there isn't a value in the ``[html]`` section. Closes `issue 1090`_. - Combining files on Windows across drives how works properly, fixing `issue 577`_. Thanks, `Valentine Lab <pr1080_>`_. - Fix an obscure warning from deep in the _decimal module, as reported in `issue 1084`_. - Update to support Python 3.10 alphas in progress, including `PEP 626: Precise line numbers for debugging and other tools <pep626_>`_. .. _issue 577: https://github.com/nedbat/coveragepy/issues/577 .. _issue 732: https://github.com/nedbat/coveragepy/issues/732 .. _issue 922: https://github.com/nedbat/coveragepy/issues/922 .. _issue 1084: https://github.com/nedbat/coveragepy/issues/1084 .. _issue 1086: https://github.com/nedbat/coveragepy/issues/1086 .. _issue 1090: https://github.com/nedbat/coveragepy/issues/1090 .. _pr1080: https://github.com/nedbat/coveragepy/pull/1080 .. _pep626: https://www.python.org/dev/peps/pep-0626/ .. _changes_531: ```

Links

- PyPI: https://pypi.org/project/coverage - Changelog: https://pyup.io/changelogs/coverage/ - Repo: https://github.com/nedbat/coveragepy

[coveralls]

Pull Request Test Coverage Report for Build 1290

• 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 100.0%

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Totals
Change from base Build 1288:	0.0%
Covered Lines:	145
Relevant Lines:	145

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #328