Update pytest-cov to 2.11.1

[pyup-bot]

This PR updates pytest-cov from 2.10.1 to 2.11.1.

Changelog

### 2.11.1 ``` ------------------- * Fixed support for newer setuptools (v42+). Contributed by Michał Górny in `451 <https://github.com/pytest-dev/pytest-cov/pull/451>`_. ``` ### 2.11.0 ``` ------------------- * Bumped minimum coverage requirement to 5.2.1. This prevents reporting issues. Contributed by Mateus Berardo de Souza Terra in `433 <https://github.com/pytest-dev/pytest-cov/pull/433>`_. * Improved sample projects (from the `examples <https://github.com/pytest-dev/pytest-cov/tree/master/examples>`_ directory) to support running `tox -e pyXY`. Now the example configures a suffixed coverage data file, and that makes the cleanup environment unnecessary. Contributed by Ganden Schaffner in `435 <https://github.com/pytest-dev/pytest-cov/pull/435>`_. * Removed the empty `console_scripts` entrypoint that confused some Gentoo build script. I didn't ask why it was so broken cause I didn't want to ruin my day. Contributed by Michał Górny in `434 <https://github.com/pytest-dev/pytest-cov/pull/434>`_. * Fixed the missing `coverage context <https://coverage.readthedocs.io/en/stable/contexts.html>`_ when using subprocesses. Contributed by Bernát Gábor in `443 <https://github.com/pytest-dev/pytest-cov/pull/443>`_. * Updated the config section in the docs. Contributed by Pamela McA'Nulty in `429 <https://github.com/pytest-dev/pytest-cov/pull/429>`_. * Migrated CI to travis-ci.com (from .org). ```

Links

- PyPI: https://pypi.org/project/pytest-cov - Changelog: https://pyup.io/changelogs/pytest-cov/ - Repo: https://github.com/pytest-dev/pytest-cov

[codecov[bot]]

Codecov Report

Merging #177 (006ebeb) into master (d4573e4) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   52.91%   52.91%           
=======================================
  Files          24       24           
  Lines        1595     1595           
=======================================
  Hits          844      844           
  Misses        751      751           

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