Update pytest-cov requirement from ==2.12.* to >=2.12,<3.1

[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

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 commands and options

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)

[dependabot]

Superseded by #157.