Bump codecov from 2.0.15 to 2.0.16 (#47)

Bumps [codecov](https://github.com/codecov/codecov-python) from 2.0.15 to 2.0.16.
- [Release notes](https://github.com/codecov/codecov-python/releases)
- [Changelog](https://github.com/codecov/codecov-python/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-python@v2.0.15...v2.0.16)

---
updated-dependencies:
- dependency-name: codecov
  dependency-type: direct:development
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

dev-requirements.txt

@@ -1,5 +1,5 @@
 -r test-requirements.txt
-codecov==2.0.15
+codecov==2.0.16
 flake8==3.7.0
 autopep8==1.4.3
 isort==4.3.4