Bump coverage from 5.1 to 5.2

Bumps [coverage](https://github.com/nedbat/coveragepy) from 5.1 to 5.2.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](coveragepy/coveragepy@coverage-5.1...coverage-5.2)

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

Author: dependabot[bot]

requirements.txt

@@ -15,5 +15,5 @@ shiboken2==5.15.0
 wcwidth==0.2.5
 zipp==3.1.0
 codecov==2.1.7
-coverage==5.1
+coverage==5.2
 pytest-cov==2.10.0