Bump codecov from 2.1.10 to 2.1.11

Bumps [codecov](https://github.com/codecov/codecov-python) from 2.1.10 to 2.1.11.
- [Release notes](https://github.com/codecov/codecov-python/releases)
- [Changelog](https://github.com/codecov/codecov-python/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-python@v2.1.10...v2.1.11)

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

requirements/ci.txt

@@ -1,4 +1,4 @@
-codecov==2.1.10
+codecov==2.1.11
 docutils==0.16
 tox==3.20.1
 tox-travis==0.12