Update pytest-cov to 4.0.0

[pyup-bot]

This PR updates pytest-cov from 2.10.1 to 4.0.0.

Changelog

4.0.0

------------------

**Note that this release drops support for multiprocessing.**


* `--cov-fail-under` no longer causes `pytest --collect-only` to fail
Contributed by Zac Hatfield-Dodds in `511 <https://github.com/pytest-dev/pytest-cov/pull/511>`_.
* Dropped support for multiprocessing (mostly because `issue 82408 <https://github.com/python/cpython/issues/82408>`_). This feature was
mostly working but very broken in certain scenarios and made the test suite very flaky and slow.

There is builtin multiprocessing support in coverage and you can migrate to that. All you need is this in your
``.coveragerc``::

 [run]
 concurrency = multiprocessing
 parallel = true
 sigterm = true
* Fixed deprecation in ``setup.py`` by trying to import setuptools before distutils.
Contributed by Ben Greiner in `545 <https://github.com/pytest-dev/pytest-cov/pull/545>`_.
* Removed undesirable new lines that were displayed while reporting was disabled.
Contributed by Delgan in `540 <https://github.com/pytest-dev/pytest-cov/pull/540>`_.
* Documentation fixes.
Contributed by Andre Brisco in `543 <https://github.com/pytest-dev/pytest-cov/pull/543>`_
and Colin O'Dell in `525 <https://github.com/pytest-dev/pytest-cov/pull/525>`_.
* Added support for LCOV output format via `--cov-report=lcov`. Only works with coverage 6.3+.
Contributed by Christian Fetzer in `536 <https://github.com/pytest-dev/pytest-cov/issues/536>`_.
* Modernized pytest hook implementation.
Contributed by Bruno Oliveira in `549 <https://github.com/pytest-dev/pytest-cov/pull/549>`_
and Ronny Pfannschmidt in `550 <https://github.com/pytest-dev/pytest-cov/pull/550>`_.

3.0.0

-------------------

**Note that this release drops support for Python 2.7 and Python 3.5.**

* Added support for Python 3.10 and updated various test dependencies.
Contributed by Hugo van Kemenade in
`500 <https://github.com/pytest-dev/pytest-cov/pull/500>`_.
* Switched from Travis CI to GitHub Actions. Contributed by Hugo van Kemenade in
`494 <https://github.com/pytest-dev/pytest-cov/pull/494>`_ and
`495 <https://github.com/pytest-dev/pytest-cov/pull/495>`_.
* Add a ``--cov-reset`` CLI option.
Contributed by Danilo Šegan in
`459 <https://github.com/pytest-dev/pytest-cov/pull/459>`_.
* Improved validation of ``--cov-fail-under`` CLI option.
Contributed by ... Ronny Pfannschmidt's desire for skark in
`480 <https://github.com/pytest-dev/pytest-cov/pull/480>`_.
* Dropped Python 2.7 support.
Contributed by Thomas Grainger in
`488 <https://github.com/pytest-dev/pytest-cov/pull/488>`_.
* Updated trove classifiers. Contributed by Michał Bielawski in
`481 <https://github.com/pytest-dev/pytest-cov/pull/481>`_.
* Reverted change for `toml` requirement.
Contributed by Thomas Grainger in
`477 <https://github.com/pytest-dev/pytest-cov/pull/477>`_.

2.12.1

-------------------

* Changed the `toml` requirement to be always be directly required (instead of being required through a coverage extra).
This fixes issues with pip-compile (`pip-tools1300 <https://github.com/jazzband/pip-tools/issues/1300>`_).
Contributed by Sorin Sbarnea in `472 <https://github.com/pytest-dev/pytest-cov/pull/472>`_.
* Documented ``show_contexts``.
Contributed by Brian Rutledge in `473 <https://github.com/pytest-dev/pytest-cov/pull/473>`_.

2.12.0

-------------------

* Added coverage's `toml` extra to install requirements in setup.py.
Contributed by Christian Riedel in `410 <https://github.com/pytest-dev/pytest-cov/pull/410>`_.
* Fixed ``pytest_cov.__version__`` to have the right value (string with version instead of a string
including ``__version__ =``).
* Fixed license classifier in ``setup.py``.
Contributed by Chris Sreesangkom in `467 <https://github.com/pytest-dev/pytest-cov/pull/467>`_.
* Fixed *commits since* badge.
Contributed by Terence Honles in `470 <https://github.com/pytest-dev/pytest-cov/pull/470>`_.

2.11.1

-------------------

* Fixed support for newer setuptools (v42+).
Contributed by Michał Górny in `451 <https://github.com/pytest-dev/pytest-cov/pull/451>`_.

2.11.0

-------------------

* Bumped minimum coverage requirement to 5.2.1. This prevents reporting issues.
Contributed by Mateus Berardo de Souza Terra in `433 <https://github.com/pytest-dev/pytest-cov/pull/433>`_.
* Improved sample projects (from the `examples <https://github.com/pytest-dev/pytest-cov/tree/master/examples>`_
directory) to support running `tox -e pyXY`. Now the example configures a suffixed coverage data file,
and that makes the cleanup environment unnecessary.
Contributed by Ganden Schaffner in `435 <https://github.com/pytest-dev/pytest-cov/pull/435>`_.
* Removed the empty `console_scripts` entrypoint that confused some Gentoo build script.
I didn't ask why it was so broken cause I didn't want to ruin my day.
Contributed by Michał Górny in `434 <https://github.com/pytest-dev/pytest-cov/pull/434>`_.
* Fixed the missing `coverage context <https://coverage.readthedocs.io/en/stable/contexts.html>`_
when using subprocesses.
Contributed by Bernát Gábor in `443 <https://github.com/pytest-dev/pytest-cov/pull/443>`_.
* Updated the config section in the docs.
Contributed by Pamela McA'Nulty in `429 <https://github.com/pytest-dev/pytest-cov/pull/429>`_.
* Migrated CI to travis-ci.com (from .org).

Links

• PyPI: https://pypi.org/project/pytest-cov
• Changelog: https://pyup.io/changelogs/pytest-cov/
• Repo: https://github.com/pytest-dev/pytest-cov