Update pytest-cov to 2.6.1

[pyup-bot]

This PR updates pytest-cov from 2.6.0 to 2.6.1.

Changelog

2.6.1

------------------

* Added support for Pytest 4.1. Contributed by Daniel Hahler and Семён Марьясин in
`253 <https://github.com/pytest-dev/pytest-cov/pull/253>`_ and
`230 <https://github.com/pytest-dev/pytest-cov/pull/230>`_.
* Various test and docs fixes. Contributed by Daniel Hahler in
`224 <https://github.com/pytest-dev/pytest-cov/pull/224>`_ and
`223 <https://github.com/pytest-dev/pytest-cov/pull/223>`_.
* Fixed the "Module already imported" issue (`211 <https://github.com/pytest-dev/pytest-cov/issues/211>`_).
Contributed by Daniel Hahler in `228 <https://github.com/pytest-dev/pytest-cov/pull/228>`_.

Links

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

[codecov]

Codecov Report

Merging #275 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #275   +/-   ##
=======================================
  Coverage   28.53%   28.53%           
=======================================
  Files          23       23           
  Lines        2215     2215           
=======================================
  Hits          632      632           
  Misses       1583     1583

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