Bump pytest-cov from 2.5.1 to 2.6.0

[dependabot-preview]

Bumps pytest-cov from 2.5.1 to 2.6.0.

Changelog

Sourced from pytest-cov's changelog.

2.6.0 (2018-09-03)

• Dropped support for Python < 3.4, Pytest < 3.5 and Coverage < 4.4.
• Fixed some documentation formatting. Contributed by Jean Jordaan and Julian.
• Added an example with addopts in documentation. Contributed by Samuel Giffard in
  #195 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/pull/195>_.
• Fixed TypeError: 'NoneType' object is not iterable in certain xdist configurations. Contributed by Jeremy Bowman in
  #213 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/pull/213>_.
• Added a no_cover marker and fixture. Fixes
  #78 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/issues/78>_.
• Fixed broken no_cover check when running doctests. Contributed by Terence Honles in
  #200 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/pull/200>_.
• Fixed various issues with path normalization in reports (when combining coverage data from parallel mode). Fixes
  #130 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/issues/161>.
  Contributed by Ryan Hiebert & Ionel Cristian Mărieș in
  #178 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/pull/178>.
• Report generation failures don't raise exceptions anymore. A warning will be logged instead. Fixes
  #161 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/issues/161>_.
• Fixed multiprocessing issue on Windows (empty env vars are not passed). Fixes
  #165 <https://github-redirect.dependabot.com/pytest-dev/pytest-cov/issues/165>_.

Commits

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[coveralls]

Pull Request Test Coverage Report for Build 149

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 147:	0.0%
Covered Lines:	478
Relevant Lines:	478

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💛 - Coveralls