Pytest-reqs

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- Drop support for Python 3.4
- Add support for pip 19.0 through 19.1.1
- Fix issue with wrong attribute name (43)

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- Remove dependency on internal pip APIs
- Add support for Python 3.7
- Add support for pip 9.0.3, 10.0.0, 10.0.1, 18.0 and 18.1

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- Add a check for max supported pip version
- Drop support for pip<7.1.0

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- Add reqs-outdate flag to check for out of date dependencies

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- Address test ordering issues

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- Adds reqsfilenamepatterns config option