Bump pytest from 3.6.3 to 3.6.4

[dependabot-preview[bot]]

Bumps pytest from 3.6.3 to 3.6.4.

Changelog

*Sourced from [pytest's changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst).* > pytest 3.6.4 (2018-07-28) > ========================= > > Bug Fixes > --------- > > - Invoke pytest using ``-mpytest`` so ``sys.path`` does not get polluted by packages installed in ``site-packages``. (`#742 `_) > > > Improved Documentation > ---------------------- > > - Use ``smtp_connection`` instead of ``smtp`` in fixtures documentation to avoid possible confusion. (`#3592 `_) > > > Trivial/Internal Changes > ------------------------ > > - Remove obsolete ``__future__`` imports. (`#2319 `_) > > - Add CITATION to provide information on how to formally cite pytest. (`#3402 `_) > > - Replace broken type annotations with type comments. (`#3635 `_) > > - Pin ``pluggy`` to ``<0.8``. (`#3727 `_)

Commits

- [`317cd41`](https://github.com/pytest-dev/pytest/commit/317cd41215cc4e6e829f86afdacf0dc15bb43e36) Preparing release version 3.6.4 - [`7f27512`](https://github.com/pytest-dev/pytest/commit/7f27512a48de0c80c10b876e7d5282fe1c3bcd8a) Pin pluggy to <0.8 - [`fe06be8`](https://github.com/pytest-dev/pytest/commit/fe06be85905ea9363323a18be489d3619d1fbab9) Merge pull request [#3723](https://github-redirect.dependabot.com/pytest-dev/pytest/issues/3723) from pytest-dev/nicoddemus-patch-1 - [`79b4ca9`](https://github.com/pytest-dev/pytest/commit/79b4ca92d8bd294b600882a281ec4519bd746680) Use "pytest" on the CHANGELOG - [`b7419bd`](https://github.com/pytest-dev/pytest/commit/b7419bd9bb2ad5b609532766ceb77e7b732e1dcf) Merge pull request [#3710](https://github-redirect.dependabot.com/pytest-dev/pytest/issues/3710) from bmwiedemann/date - [`2e344d4`](https://github.com/pytest-dev/pytest/commit/2e344d4d63aaf32a759d602aee4e3f69a24e90dd) Do not claim copyright for future years - [`f761425`](https://github.com/pytest-dev/pytest/commit/f76142508f2b24cdee93453088c6999dc54f99bb) Merge pull request [#3694](https://github-redirect.dependabot.com/pytest-dev/pytest/issues/3694) from drewrisinger/patch-2 - [`be2afb9`](https://github.com/pytest-dev/pytest/commit/be2afb950ac2e7df8866b66edeaa9294c88e5714) Merge pull request [#3706](https://github-redirect.dependabot.com/pytest-dev/pytest/issues/3706) from ehershey/patch-1 - [`19de1b7`](https://github.com/pytest-dev/pytest/commit/19de1b7f291d21b4b6e38c8627a79231a2f21cc7) typo - PYTEST_ADDOTPS -> PYTEST_ADDOPTS - [`9720c33`](https://github.com/pytest-dev/pytest/commit/9720c3301aa3296f941c71a0f45bcd7054c0c9fc) Merge pull request [#3690](https://github-redirect.dependabot.com/pytest-dev/pytest/issues/3690) from drewrisinger/patch-1 - Additional commits viewable in [compare view](https://github.com/pytest-dev/pytest/compare/3.6.3...3.6.4)

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[sloria]

@dependabot merge

[dependabot-preview[bot]]

OK, I'll merge this once your CI passes on it.