Bump pytest-cov from 2.9.0 to 2.10.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.9.0 to 2.10.0.
- [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@v2.9.0...v2.10.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -32,7 +32,7 @@ pycodestyle==2.6.0        # via flake8
 pyflakes==2.2.0           # via flake8
 pygments==2.6.1           # via sphinx
 pyparsing==2.4.6          # via packaging
-pytest-cov==2.9.0         # via -r requirements.in
+pytest-cov==2.10.0        # via -r requirements.in
 pytest-mock==3.1.1        # via -r requirements.in
 pytest==5.4.3             # via -r requirements.in, pytest-cov, pytest-mock
 python-dateutil==2.7.3    # via croniter