Update tox to 2.9.1

[pyup-bot]

There's a new version of tox available.
You are currently using 2.7.0. I have updated it to 2.9.1

These links might come in handy: PyPI | Changelog | Docs

Changelog

2.9.1

---

Misc
^^^^

• integrated new release process and fixed changelog rendering for pypi.org -
  by obestwalter <https://github.com/obestwalter>_.

2.9

2.9.0

---

Features
^^^^^^^^

• tox --version now shows information about all registered plugins - by
  obestwalter <https://github.com/obestwalter>_
  (544 <https://github.com/tox-dev/tox/issues/544>_)

Bugfixes
^^^^^^^^

• skip_install overrides usedevelop (usedevelop is an option to
  choose the installation type if the package is installed and skip_install
  determines if it should be installed at all) - by ferdonline <https://github.com/ferdonline>_
  (571 <https://github.com/tox-dev/tox/issues/571>_)

Misc
^^^^

• 635 <https://github.com/tox-dev/tox/issues/635>_ inherit from correct exception -
  by obestwalter <https://github.com/obestwalter>_
  (635 <https://github.com/tox-dev/tox/issues/635>_).
• spelling and escape sequence fixes - by scoop <https://github.com/scoop>_
  (637 <https://github.com/tox-dev/tox/issues/637>_ and
  638 <https://github.com/tox-dev/tox/issues/638>_).
• add a badge to show build status of documentation on readthedocs.io -
  by obestwalter <https://github.com/obestwalter>_.

Improved Documentation
^^^^^^^^^^^^^^^^^^^^^^

• add towncrier <https://github.com/hawkowl/towncrier>_ to allow adding
  changelog entries with the pull requests without generating merge conflicts;
  with this release notes are now grouped into four distinct collections:
  Features, Bugfixes, Improved Documentation and Deprecations and Removals. (614 <https://github.com/tox-dev/tox/issues/614>_)

2.8.2

---

• 466 <https://github.com/tox-dev/tox/issues/466>_: stop env var leakage if popen failed with resultjson or redirect

2.8.1

---

• pull request 599 <https://github.com/tox-dev/tox/pull/599>: fix problems with implementation of 515 <https://github.com/tox-dev/tox/issues/515>.
  Substitutions from other sections were not made anymore if they were not in envlist.
  Thanks to Clark Boylan (cboylan <https://github.com/cboylan>) for helping to get this fixed (pull request 597 <https://github.com/tox-dev/tox/pull/597>).

2.8

..
Everything below here is generated by towncrier <https://pypi.python.org/pypi/towncrier>_.
It is generated once as part of the release process rendering fragments from the changelog
folder. If necessary, the generated text can be edited afterwards to e.g. merge rc changes
into the final release notes.

.. towncrier release notes start

2.8.0

---

• 276 <https://github.com/tox-dev/tox/issues/276>: Remove easy_install from docs (TL;DR: use pip). Thanks Martin Andrysík (sifuraz <https://github.com/sifuraz>).

• 301 <https://github.com/tox-dev/tox/issues/301>: Expand nested substitutions in tox.ini. Thanks vlaci <https://github.com/vlaci>. Thanks to Eli Collins
  (eli-collins <https://github.com/eli-collins>_) for creating a reproducer.

• 315 <https://github.com/tox-dev/tox/issues/315>: add --help and --version to helptox-quickstart. Thanks vlaci <https://github.com/vlaci>.

• 326 <https://github.com/tox-dev/tox/issues/326>: Fix OSError 'Not a directory' when creating env on Jython 2.7.0. Thanks Nick Douma (LordGaav <https://github.com/LordGaav>).

• 429 <https://github.com/tox-dev/tox/issues/429>: Forward MSYSTEM by default on Windows. Thanks Marius Gedminas (mgedmin <https://github.com/mgedmin>) for reporting this.

• 449 <https://github.com/tox-dev/tox/issues/449>: add multi platform example to the docs. Thanks Aleks Bunin (sashkab <https://github.com/sashkab>) and rndr <https://github.com/rndr>_.

• 474 <https://github.com/tox-dev/tox/issues/474>_: Start using setuptools_scm for tag based versioning.

• 484 <https://github.com/tox-dev/tox/issues/484>: Renamed py.test to pytest throughout the project. Thanks Slam (3lnc <https://github.com/3lnc>).

• 504 <https://github.com/tox-dev/tox/issues/504>: With -a: do not show additional environments header if there are none. Thanks rndr <https://github.com/rndr>.

• 515 <https://github.com/tox-dev/tox/issues/515>: Don't require environment variables in test environments where they are not used.
  Thanks André Caron (AndreLouisCaron <https://github.com/AndreLouisCaron>).
• 517 <https://github.com/tox-dev/tox/issues/517>: Forward NUMBER_OF_PROCESSORS by default on Windows to fix multiprocessor.cpu_count().
  Thanks André Caron (AndreLouisCaron <https://github.com/AndreLouisCaron>).

• 518 <https://github.com/tox-dev/tox/issues/518>: Forward USERPROFILE by default on Windows. Thanks André Caron (AndreLouisCaron <https://github.com/AndreLouisCaron>).

• pull request 528 <https://github.com/tox-dev/tox/pull/528>: Fix some of the warnings displayed by pytest 3.1.0. Thanks Bruno Oliveira (nicoddemus <https://github.com/nicoddemus>).

• pull request 547 <https://github.com/tox-dev/tox/pull/547>: Add regression test for 137 <https://github.com/tox-dev/tox/issues/137>. Thanks Martin Andrysík (sifuraz <https://github.com/sifuraz>_).

• pull request 553 <https://github.com/tox-dev/tox/pull/553>: Add an XFAIL test to reproduce upstream bug 203 <https://github.com/tox-dev/tox/issues/203>. Thanks
  Bartolomé Sánchez Salado (bartsanchez <https://github.com/bartsanchez>_).

• pull request 556 <https://github.com/tox-dev/tox/pull/556>: Report more meaningful errors on why virtualenv creation failed. Thanks vlaci <https://github.com/vlaci>.
  Also thanks to Igor Sadchenko (igor-sadchenko <https://github.com/igor-sadchenko>_) for pointing out a problem with that PR
  before it hit the masses ☺

• pull request 575 <https://github.com/tox-dev/tox/pull/575>_: Add announcement doc to end all announcement docs
  (using only CHANGELOG and Github issues since 2.5 already).

• pull request 580 <https://github.com/tox-dev/tox/pull/580>: Do not ignore Sphinx warnings anymore. Thanks Bernát Gábor (gaborbernat <https://github.com/gaborbernat>).

• pull request 585 <https://github.com/tox-dev/tox/pull/585>: Expand documentation to explain pass through of flags from deps to pip
  (e.g. -rrequirements.txt, -cconstraints.txt). Thanks Alexander Loechel (loechel <https://github.com/loechel>).

• pull request 588 <https://github.com/tox-dev/tox/pull/588>_: Run pytest wit xfail_strict and adapt affected tests.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖