Bump coverage from 5.0.1 to 5.0.3

Bumps [coverage](https://github.com/nedbat/coveragepy) from 5.0.1 to 5.0.3.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@coverage-5.0.1...coverage-5.0.3)

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

Author: dependabot-preview[bot]

setup.py

@@ -25,7 +25,7 @@ def get_version():
     "pylint==2.4.4",
     "pytest==5.3.2",
     "black==19.10b0",
-    "coverage==5.0.1",
+    "coverage==5.0.3",
     "pytest-cov==2.8.1",
     "hypothesis>=4.42.0,<6.0",
     "attrs>=19.2",