[3.6] Bump pytest-cov from 2.7.1 to 2.8.0

[dependabot-preview]

Bumps pytest-cov from 2.7.1 to 2.8.0.

Changelog

Sourced from pytest-cov's changelog.

2.8.0 (2019-10-04)

• Fixed RecursionError that can occur when using cleanup_on_signal or cleanup_on_sigterm. See: #294. The 2.7.x releases of pytest-cov should be considered broken regarding aforementioned cleanup API.
• Added compatibility with future xdist release that deprecates some internals (match pytest-xdist master/worker terminology). Contributed by Thomas Grainger in #321
• Fixed breakage that occurs when multiple reporting options are used. Contributed by Thomas Grainger in #338.
• Changed internals to use a stub instead of os.devnull. Contributed by Thomas Grainger in #332.
• Added support for Coverage 5.0. Contributed by Ned Batchelder in #319.
• Added support for float values in --cov-fail-under. Contributed by Martín Gaitán in #311.
• Various documentation fixes. Contributed by Juanjo Bazán, Andrew Murray and Albert Tugushev in #298, #299 and #307.
• Various testing improvements. Contributed by Ned Batchelder, Daniel Hahler, Ionel Cristian Mărieș and Hugo van Kemenade in #313, #314, #315, #316, #325, #326, #334 and #335.
• Added the --cov-context CLI options that enables coverage contexts. Only works with coverage 5.0+. Contributed by Ned Batchelder in #345.

Commits

• 5df26bd Bump version: 2.7.1 → 2.8.0
• 9f227c2 Add xdist 0.30 and update bootstrap.py to work better (on windows too).
• 5cc697f Add a note about the cleanup fix.
• 7c01530 Update changelog and authors.
• 994fb00 Update for coverage 5.0a8
• 5f70ec4 Sort imports and add isort as a check.
• a4d952d The --cov-context option for setting context per test
• 419a010 No need to skip for coverage < 4, we don't support coverage < 4
• f4a4a29 Pytest 5.2 is out
• d3bac1b Properly deal with configurable HTML output dirs
• Additional commits viewable in compare view

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[codecov-io]

Codecov Report

Merging #4144 into 3.6 will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             3.6    #4144      +/-   ##
=========================================
- Coverage   98.1%   98.06%   -0.05%     
=========================================
  Files         44       44              
  Lines       8871     8871              
  Branches    1391     1391              
=========================================
- Hits        8703     8699       -4     
- Misses        63       66       +3     
- Partials     105      106       +1

Impacted Files	Coverage Δ
aiohttp/web_fileresponse.py	96.59% <0%> (-1.14%)	⬇️
aiohttp/connector.py	97.43% <0%> (-0.33%)	⬇️

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