chore(deps): update pytest-cov requirement from ~=2.12 to ~=3.0 (#641)

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [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@v2.12.0...v3.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:production
...

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Author: dependabot[bot]

Pipfile

@@ -12,7 +12,7 @@ selenium = "~=3.141"
 black = "==20.8b1"
 
 pytest = "~=6.2"
-pytest-cov = "~=2.12"
+pytest-cov = "~=3.0"
 
 tox = "~=3.24"