Bump pytest-cov from 2.6.1 to 2.8.1

[dependabot-preview]

Bumps pytest-cov from 2.6.1 to 2.8.1.

Changelog

Sourced from pytest-cov's changelog.

2.8.1 (2019-10-05)

• Fixed #348 -regression when only certain reports (html or xml) are used then --cov-fail-under always fails.

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.

2.7.1 (2019-05-03)

• Fixed source distribution manifest so that garbage ain't included in the tarball.

2.7.0 (2019-05-03)

• Fixed AttributeError: 'NoneType' object has no attribute 'configure_node' error when --no-cov is used. Contributed by Alexander Shadchin in #263.
• Various testing and CI improvements. Contributed by Daniel Hahler in #255, #266, #272, #271 and #269.
• Improved documentation regarding subprocess and multiprocessing. Contributed in #265.
• Improved pytest_cov.embed.cleanup_on_sigterm to be reentrant (signal deliveries while signal handling is running won't break stuff).
• Added pytest_cov.embed.cleanup_on_signal for customized cleanup.
• Improved cleanup code and fixed various issues with leftover data files. All contributed in #265 or #262.
• Improved examples. Now there are two examples for the common project layouts, complete with working coverage configuration. The examples have CI testing. Contributed in #267.
• Improved help text for CLI options.

Commits

• 33894b5 Bump version: 2.8.0 → 2.8.1
• 3aa43a0 Be more strict - return None so problems like #348 will trip up the later Non...
• a078b55 Update changelog.
• 5ef4767 Fix regression described in #348 - not all reports returning the total.
• 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.
• Additional commits viewable in compare view

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