Update coverage to 4.5.1

[pyup-bot]

There's a new version of coverage available.
You are currently using 4.5. I have updated it to 4.5.1

These links might come in handy: PyPI | Changelog | Repo

Changelog

4.5.1

---

• Now that 4.5 properly separated the [run] omit and [report] omit
  settings, an old bug has become apparent. If you specified a package name
  for [run] source, then omit patterns weren't matched inside that package.
  This bug (issue 638_) is now fixed.

• On Python 3.7, reporting about a decorated function with no body other than a
  docstring would crash coverage.py with an IndexError (issue 640_). This is
  now fixed.

• Configurer plugins are now reported in the output of --debug=sys.

.. _issue 638: https://bitbucket.org/ned/coveragepy/issues/638/run-omit-is-ignored-since-45
.. _issue 640: https://bitbucket.org/ned/coveragepy/issues/640/indexerror-reporting-on-an-empty-decorated

.. _changes_45:

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖