Update pytest-cov to 2.5.1

[pyup-bot]

There's a new version of pytest-cov available.
You are currently using 2.4.0. I have updated it to 2.5.1

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

Changelog

2.5.1

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• Fixed xdist breakage (regression in 2.5.0).
  Fixes 157 <https://github.com/pytest-dev/pytest-cov/issues/157>_.
• Allow setting custom data_file name in .coveragerc.
  Fixes 145 <https://github.com/pytest-dev/pytest-cov/issues/145>.
  Contributed by Jannis Leidel & Ionel Cristian Mărieș in
  156 <https://github.com/pytest-dev/pytest-cov/pull/156>.

2.5.0

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• Always show a summary when --cov-fail-under is used. Contributed by Francis Niu in PR141 <https://github.com/pytest-dev/pytest-cov/pull/141>_.
• Added --cov-branch option. Fixes 85 <https://github.com/pytest-dev/pytest-cov/issues/85>_.
• Improve exception handling in subprocess setup. Fixes 144 <https://github.com/pytest-dev/pytest-cov/issues/144>_.
• Fixed handling when --cov is used multiple times. Fixes 151 <https://github.com/pytest-dev/pytest-cov/issues/151>_.

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

Happy merging! 🤖

[codecov-io]

Codecov Report

Merging #147 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   81.15%   81.08%   -0.08%     
==========================================
  Files          23       22       -1     
  Lines        3555     3531      -24     
  Branches      728      728              
==========================================
- Hits         2885     2863      -22     
+ Misses        391      389       -2     
  Partials      279      279

Impacted Files	Coverage Δ
aioes/__init__.py

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