build(deps-dev): bump pytest-cov from 2.12.1 to 3.0.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.12.1 to 3.0.0.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v2.12.1...v3.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Pipfile

@@ -11,7 +11,7 @@ flake8 = "==3.9.2"
 pre-commit = "==2.15.0"
 pylint = "==2.11.1"
 pytest = "==6.2.5"
-pytest-cov = "==2.12.1"
+pytest-cov = "==3.0.0"
 
 [packages]
 PyYAML = "==5.4.1"