chore(deps-dev): bump pytest-cov from 2.12.1 to 3.0.0 (#730)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.12.1 to 3.0.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst">pytest-cov's changelog</a>.</em></p>
<blockquote>
<h2>3.0.0 (2021-10-04)</h2>
<p><strong>Note that this release drops support for Python 2.7 and Python 3.5.</strong></p>
<ul>
<li>Added support for Python 3.10 and updated various test dependencies.
Contributed by Hugo van Kemenade in
<code>[#500](pytest-dev/pytest-cov#500) &lt;https://github.com/pytest-dev/pytest-cov/pull/500&gt;</code>_.</li>
<li>Switched from Travis CI to GitHub Actions. Contributed by Hugo van Kemenade in
<code>[#494](pytest-dev/pytest-cov#494) &lt;https://github.com/pytest-dev/pytest-cov/pull/494&gt;</code>_ and
<code>[#495](pytest-dev/pytest-cov#495) &lt;https://github.com/pytest-dev/pytest-cov/pull/495&gt;</code>_.</li>
<li>Add a <code>--cov-reset</code> CLI option.
Contributed by Danilo Šegan in
<code>[#459](pytest-dev/pytest-cov#459) &lt;https://github.com/pytest-dev/pytest-cov/pull/459&gt;</code>_.</li>
<li>Improved validation of <code>--cov-fail-under</code> CLI option.
Contributed by ... Ronny Pfannschmidt's desire for skark in
<code>[#480](pytest-dev/pytest-cov#480) &lt;https://github.com/pytest-dev/pytest-cov/pull/480&gt;</code>_.</li>
<li>Dropped Python 2.7 support.
Contributed by Thomas Grainger in
<code>[#488](pytest-dev/pytest-cov#488) &lt;https://github.com/pytest-dev/pytest-cov/pull/488&gt;</code>_.</li>
<li>Updated trove classifiers. Contributed by Michał Bielawski in
<code>[#481](pytest-dev/pytest-cov#481) &lt;https://github.com/pytest-dev/pytest-cov/pull/481&gt;</code>_.</li>
</ul>
<h2>2.13.0 (2021-06-01)</h2>
<ul>
<li>Changed the <code>toml</code> requirement to be always be directly required (instead of being required through a coverage extra).
This fixes issues with pip-compile (<code>pip-tools#1300 &lt;https://github.com/jazzband/pip-tools/issues/1300&gt;</code><em>).
Contributed by Sorin Sbarnea in <code>[#472](pytest-dev/pytest-cov#472) &lt;https://github.com/pytest-dev/pytest-cov/pull/472&gt;</code></em>.</li>
<li>Documented <code>show_contexts</code>.
Contributed by Brian Rutledge in <code>[#473](pytest-dev/pytest-cov#473) &lt;https://github.com/pytest-dev/pytest-cov/pull/473&gt;</code>_.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/560b95575efe9e55874bc8bbc99de1dd2db80ba9"><code>560b955</code></a> Bump version: 2.12.1 → 3.0.0</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/e988a6c48b45924433c9b38886f759f4f3be8a94"><code>e988a6c</code></a> Update changelog.</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/f01593218d2cc99defa202a8e7ff83e3a08a7a73"><code>f015932</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-cov/issues/500">#500</a> from hugovk/add-3.10</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/60a3cc1e796428f2373fb2024122f8dbc7f1c56b"><code>60a3cc1</code></a> No need to build universal wheels for Python 3-only</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/0bc997adfea8b6ab63029163044a2fc42fd7ecf1"><code>0bc997a</code></a> Add support for Python 3.10</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/679935b82e8177799c34981e8f384a5466840301"><code>679935b</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-cov/issues/494">#494</a> from hugovk/test-on-github-actions</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/96f9aad28a35d9d0824add0ef2309e600052c531"><code>96f9aad</code></a> Add 'all good' job to be added as a required build</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/6395ecec756433194c05d34af490315b35dddafa"><code>6395ece</code></a> Test conditional collection on PyPy and CPython</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/f4a88d6187630295ce960010456def6b19ef01b2"><code>f4a88d6</code></a> Test both PyPy3.6 and PyPy3.7</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/a948e899fa002fbc7f52c6c0f7e7dffdf7987ec8"><code>a948e89</code></a> Test both PyPy3.6 and PyPy3.7</li>
<li>Additional commits viewable in <a href="https://github.com/pytest-dev/pytest-cov/compare/v2.12.1...v3.0.0">compare view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pytest-cov&package-manager=pip&previous-version=2.12.1&new-version=3.0.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)


</details>

pyproject.toml

@@ -41,7 +41,7 @@ flake8-fixme = "^1.1.1"
 flake8-isort = "^4.0.0"
 flake8-variables-names = "^0.0.4"
 isort = "^5.9.3"
-pytest-cov = "^2.12.1"
+pytest-cov = "^3.0.0"
 pytest-mock = "^3.5.1"
 pdoc3 = "^0.10.0"
 pytest-asyncio = "^0.15.1"