Update pytest-cov requirement from ==2.12.* to ==3.0.*

[dependabot]

Updates the requirements on pytest-cov to permit the latest version.

Changelog

Sourced from pytest-cov's changelog.

3.0.0 (2021-10-04)

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/issues/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/issues/494) <https://github.com/pytest-dev/pytest-cov/pull/494>_ and [#495](https://github.com/pytest-dev/pytest-cov/issues/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/issues/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/issues/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/issues/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/issues/481) <https://github.com/pytest-dev/pytest-cov/pull/481>_.

2.13.0 (2021-06-01)

• 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-tools#1300 <https://github.com/jazzband/pip-tools/issues/1300>). Contributed by Sorin Sbarnea in [#472](https://github.com/pytest-dev/pytest-cov/issues/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/issues/473) <https://github.com/pytest-dev/pytest-cov/pull/473>_.

2.12.1 (2021-06-01)

• 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-tools#1300 <https://github.com/jazzband/pip-tools/issues/1300>). Contributed by Sorin Sbarnea in [#472](https://github.com/pytest-dev/pytest-cov/issues/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/issues/473) <https://github.com/pytest-dev/pytest-cov/pull/473>_.

2.12.0 (2021-05-14)

• Added coverage's toml extra to install requirements in setup.py. Contributed by Christian Riedel in [#410](https://github.com/pytest-dev/pytest-cov/issues/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__ =).

... (truncated)

Commits

• 560b955 Bump version: 2.12.1 → 3.0.0
• e988a6c Update changelog.
• f015932 Merge pull request #500 from hugovk/add-3.10
• 60a3cc1 No need to build universal wheels for Python 3-only
• 0bc997a Add support for Python 3.10
• 679935b Merge pull request #494 from hugovk/test-on-github-actions
• 96f9aad Add 'all good' job to be added as a required build
• 6395ece Test conditional collection on PyPy and CPython
• f4a88d6 Test both PyPy3.6 and PyPy3.7
• a948e89 Test both PyPy3.6 and PyPy3.7
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #98 (37bcb69) into main (4ea2211) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   68.11%   68.11%           
=======================================
  Files           5        5           
  Lines         323      323           
  Branches       65       65           
=======================================
  Hits          220      220           
  Misses         73       73           
  Partials       30       30           

[Guts]

@dependabot rebase