build(deps): bump codecov from 2.0.16 to 2.0.22

Bumps [codecov](https://github.com/codecov/codecov-python) from 2.0.16 to 2.0.22.
- [Release notes](https://github.com/codecov/codecov-python/releases)
- [Changelog](https://github.com/codecov/codecov-python/blob/v2.0.22/CHANGELOG.md)
- [Commits](codecov/codecov-python@v2.0.16...v2.0.22)

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

Author: dependabot-preview[bot]

travis/requirements.txt

@@ -5,5 +5,5 @@ responses==0.10.9
 pytest-cov==2.8.1
 pytest-random-order==1.0.4
 pytest-travis-fold==1.3.0
-codecov==2.0.16
+codecov==2.0.22
 -r ../requirements.txt