Bump codecov from 2.0.22 to 2.1.8

Bumps [codecov](https://github.com/codecov/codecov-python) from 2.0.22 to 2.1.8.
- [Release notes](https://github.com/codecov/codecov-python/releases)
- [Changelog](https://github.com/codecov/codecov-python/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-python@v2.0.22...2.1.8)

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

Author: dependabot[bot]

requirements.txt

@@ -31,7 +31,7 @@ xgboost==1.1.1
 pytest==5.4.1
 pytest-pep8==1.0.6
 pytest-mock==3.2.0
-codecov==2.0.22
+codecov==2.1.8
 requests==2.23.0
 
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