Bump coverage from 4.5.2 to 5.0.1

Bumps [coverage](https://github.com/nedbat/coveragepy) from 4.5.2 to 5.0.1.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@coverage-4.5.2...coverage-5.0.1)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -7,7 +7,7 @@ cffi==1.12.3
 chardet==3.0.4
 Click==7.0
 cmarkgfm==0.4.2
-coverage==4.5.2
+coverage==5.0.1
 cycler==0.10.0
 docutils==0.14
 execnet==1.6.0