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-dev.txt

@@ -3,7 +3,7 @@ coveralls==2.0.0
 ddt==1.4.1
 flake8-import-order==0.18.1
 pytest==5.4.3
-pytest-cov==2.9.0
+pytest-cov==2.10.0
 pytest-json==0.4.0
 pytest-pythonpath==0.7.3
 pylama==7.7.1