Update pytest-cov in requirements-dev.txt from 2.5.1 to 2.6.0#33

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dependencies[bot] wants to merge 1 commit intomasterfrom pytest-cov-2.6.0-305.1.0

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Commits on Sep 4, 2018

Update pytest-cov from 2.5.1 to 2.6.0
dependencies-bot
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