Update tox to 3.23.0

[pyup-bot]

This PR updates tox from 3.14.3 to 3.23.0.

Changelog

3.22.0

--------------------

Features
^^^^^^^^

- The value of the :conf:`requires` configuration option is now exposed via
the :class:`tox.config.Config` object - by :user:`hroncok`
`1918 <https://github.com/tox-dev/tox/issues/1918>`_

3.21.4

--------------------

Bugfixes
^^^^^^^^

- Adapt tests not to assume the ``easy_install`` command exists, as it was removed from ``setuptools`` 52.0.0+ - by :user:`hroncok`
`1893 <https://github.com/tox-dev/tox/issues/1893>`_

3.21.3

--------------------

Bugfixes
^^^^^^^^

- Fix a killed tox (via SIGTERM) leaving the commands subprocesses running
by handling it as if it were a KeyboardInterrupt - by :user:`dajose`
`1772 <https://github.com/tox-dev/tox/issues/1772>`_

3.21.2

--------------------

Bugfixes
^^^^^^^^

- Newer coverage tools update the ``COV_CORE_CONTEXT`` environment variable, add it to the list of environment variables
that can change in our pytest plugin - by :user:`gaborbernat`.
`1854 <https://github.com/tox-dev/tox/issues/1854>`_

3.21.1

--------------------

Bugfixes
^^^^^^^^

- Fix regression that broke using install_command in config replacements - by :user:`jayvdb`
`1777 <https://github.com/tox-dev/tox/issues/1777>`_
- Fix regression parsing posargs default containing colon. - by :user:`jayvdb`
`1785 <https://github.com/tox-dev/tox/issues/1785>`_


Features
^^^^^^^^

- Prevent .tox in envlist - by :user:`jayvdb`
`1684 <https://github.com/tox-dev/tox/issues/1684>`_


Miscellaneous
^^^^^^^^^^^^^

- Enable building tox with ``setuptools_scm`` 4 and 5 by :user:`hroncok`
`1799 <https://github.com/tox-dev/tox/issues/1799>`_

3.21.0

--------------------

Bugfixes
^^^^^^^^

- Fix the false ``congratulations`` message that appears when a ``KeyboardInterrupt`` occurs during package installation. - by :user:`gnikonorov`
`1453 <https://github.com/tox-dev/tox/issues/1453>`_
- Fix ``platform`` support for ``install_command``. - by :user:`jayvdb`
`1464 <https://github.com/tox-dev/tox/issues/1464>`_
- Fixed regression in v3.20.0 that caused escaped curly braces in setenv
to break usage of the variable elsewhere in tox.ini. - by :user:`jayvdb`
`1690 <https://github.com/tox-dev/tox/issues/1690>`_
- Prevent ``{}`` and require ``{:`` is only followed by ``}``. - by :user:`jayvdb`
`1711 <https://github.com/tox-dev/tox/issues/1711>`_
- Raise ``MissingSubstitution`` on access of broken ini setting. - by :user:`jayvdb`
`1716 <https://github.com/tox-dev/tox/issues/1716>`_


Features
^^^^^^^^

- Allow \{ and \} in default of {env:key:default}. - by :user:`jayvdb`
`1502 <https://github.com/tox-dev/tox/issues/1502>`_
- Allow {posargs} in setenv. - by :user:`jayvdb`
`1695 <https://github.com/tox-dev/tox/issues/1695>`_
- Allow {/} to refer to os.sep. - by :user:`jayvdb`
`1700 <https://github.com/tox-dev/tox/issues/1700>`_
- Make parsing [testenv] sections in setup.cfg official. - by :user:`mauvilsa`
`1727 <https://github.com/tox-dev/tox/issues/1727>`_
- Relax importlib requirement to allow 3.0.0 or any newer version - by
:user:`pkolbus`
`1763 <https://github.com/tox-dev/tox/issues/1763>`_


Documentation
^^^^^^^^^^^^^

- Document more info about using ``platform`` setting. - by :user:`prakhargurunani`
`1144 <https://github.com/tox-dev/tox/issues/1144>`_
- Replace ``indexserver`` in documentation with environment variables - by :user:`ziima`.
`1357 <https://github.com/tox-dev/tox/issues/1357>`_
- Document that the ``passenv`` environment setting is case insensitive. - by :user:`gnikonorov`
`1534 <https://github.com/tox-dev/tox/issues/1534>`_

3.20.1

--------------------

Bugfixes
^^^^^^^^

- Relax importlib requirement to allow version<3 - by :user:`usamasadiq`
`1682 <https://github.com/tox-dev/tox/issues/1682>`_

3.20.0

--------------------

Bugfixes
^^^^^^^^

- Allow hyphens and empty factors in generative section name. - by :user:`tyagdit`
`1636 <https://github.com/tox-dev/tox/issues/1636>`_
- Support for PEP517 in-tree build backend-path key in ``get-build-requires``. - by :user:`nizox`
`1654 <https://github.com/tox-dev/tox/issues/1654>`_
- Allow escaping curly braces in setenv. - by :user:`mkenigs`
`1656 <https://github.com/tox-dev/tox/issues/1656>`_


Features
^^^^^^^^

- Support for comments within ``setenv`` and environment files via the ``files|`` prefix. - by :user:`gaborbernat`
`1667 <https://github.com/tox-dev/tox/issues/1667>`_

3.19.0

--------------------

Bugfixes
^^^^^^^^

- skip ``setup.cfg`` if it has no ``tox:tox`` namespace - by :user:`hroncok`
`1045 <https://github.com/tox-dev/tox/issues/1045>`_


Features
^^^^^^^^

- Implement support for building projects
having :pep:`517in-tree-build-backends` ``backend-path`` setting -
by :user:`webknjaz`
`1575 <https://github.com/tox-dev/tox/issues/1575>`_
- Don't require a tox config file for ``tox --devenv`` - by :user:`hroncok`
`1643 <https://github.com/tox-dev/tox/issues/1643>`_


Documentation
^^^^^^^^^^^^^

- Fixed grammar in top-level documentation - by :user:`tfurf`
`1631 <https://github.com/tox-dev/tox/issues/1631>`_

3.18.1

--------------------

Bugfixes
^^^^^^^^

- Fix ``TypeError`` when using isolated_build with backends that are not submodules (e.g. ``maturin``)
`1629 <https://github.com/tox-dev/tox/issues/1629>`_

3.18.0

--------------------

Deprecations (removal in next major release)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Add allowlist_externals alias to whitelist_externals (whitelist_externals is now deprecated). - by :user:`dajose`
`1491 <https://github.com/tox-dev/tox/issues/1491>`_

3.17.1

--------------------

Bugfixes
^^^^^^^^

- Fix tests when the ``HOSTNAME`` environment variable is set, but empty string - by :user:`hroncok`
`1616 <https://github.com/tox-dev/tox/issues/1616>`_

3.17.0

--------------------

Features
^^^^^^^^

- The long arguments ``--verbose`` and ``--quiet`` (rather than only their short forms, ``-v`` and ``-q``) are now accepted.
`1612 <https://github.com/tox-dev/tox/issues/1612>`_
- The ``ResultLog`` now prefers ``HOSTNAME`` environment variable value (if set) over the full qualified domain name of localhost.
This makes it possible to disable an undesired DNS lookup,
which happened on all ``tox`` invocations, including trivial ones - by :user:`hroncok`
`1615 <https://github.com/tox-dev/tox/issues/1615>`_


Documentation
^^^^^^^^^^^^^

- Update packaging information for Flit.
`1613 <https://github.com/tox-dev/tox/issues/1613>`_

3.16.1

--------------------

Bugfixes
^^^^^^^^

- Fixed the support for using ``{temp_dir}`` in ``tox.ini`` - by :user:`webknjaz`
`1609 <https://github.com/tox-dev/tox/issues/1609>`_

3.16.0

--------------------

Features
^^^^^^^^

- Allow skipping the package and installation step when passing the ``--skip-pkg-install``. This should be used in pair with the ``--notest``, so you can separate environment setup and test run:

.. code-block:: console

   tox -e py --notest
   tox -e py --skip-pkg-install

by :user:`gaborbernat`.
`1605 <https://github.com/tox-dev/tox/issues/1605>`_


Miscellaneous
^^^^^^^^^^^^^

- Improve config parsing performance by precompiling commonly used regular expressions - by :user:`brettlangdon`
`1603 <https://github.com/tox-dev/tox/issues/1603>`_

3.15.2

--------------------

Bugfixes
^^^^^^^^

- Add an option to allow a process to suicide before sending the SIGTERM. - by :user:`jhesketh`
`1497 <https://github.com/tox-dev/tox/issues/1497>`_
- PyPy 7.3.1 on Windows uses the ``Script`` folder instead of ``bin``. - by :user:`gaborbernat`
`1597 <https://github.com/tox-dev/tox/issues/1597>`_


Miscellaneous
^^^^^^^^^^^^^

- Allow to run the tests with pip 19.3.1 once again while preserving the ability to use pip 20.1 - by :user:`hroncok`
`1594 <https://github.com/tox-dev/tox/issues/1594>`_

3.15.1

--------------------

Bugfixes
^^^^^^^^

- ``tox --showconfig`` no longer tries to interpolate '%' signs.
`1585 <https://github.com/tox-dev/tox/issues/1585>`_

3.15.0

--------------------

Bugfixes
^^^^^^^^

- Respect attempts to change ``PATH`` via ``setenv`` - by :user:`aklajnert`.
`1423 <https://github.com/tox-dev/tox/issues/1423>`_
- Fix parsing of architecture in python interpreter name. - by :user:`bruchar1`
`1542 <https://github.com/tox-dev/tox/issues/1542>`_
- Prevent exception when command is empty. - by :user:`bruchar1`
`1544 <https://github.com/tox-dev/tox/issues/1544>`_
- Fix irrelevant Error message for invalid argument when running outside a directory with tox support files by :user:`nkpro2000sr`.
`1547 <https://github.com/tox-dev/tox/issues/1547>`_


Features
^^^^^^^^

- Allow parallel mode without arguments. - by :user:`ssbarnea`
`1418 <https://github.com/tox-dev/tox/issues/1418>`_
- Allow generative section name expansion. - by :user:`bruchar1`
`1545 <https://github.com/tox-dev/tox/issues/1545>`_
- default to passing the env var PIP_EXTRA_INDEX_URL by :user:`georgealton`.
`1561 <https://github.com/tox-dev/tox/issues/1561>`_


Documentation
^^^^^^^^^^^^^

- Improve documentation about config by adding tox environment description at start - by :user:`stephenfin`.
`1573 <https://github.com/tox-dev/tox/issues/1573>`_

3.14.6

--------------------

Bugfixes
^^^^^^^^

- Exclude virtualenv dependency versions with known
regressions (20.0.[0-7]) - by :user:`webknjaz`.
`1537 <https://github.com/tox-dev/tox/issues/1537>`_
- Fix ``tox -h`` and ``tox --hi`` shows an error when run outside a directory with tox support files by :user:`nkpro2000sr`.
`1539 <https://github.com/tox-dev/tox/issues/1539>`_
- Fix ValueError on ``tox -l`` for a ``tox.ini`` file that does not contain an
``envlist`` definition. - by :user:`jquast`.
`1343 <https://github.com/tox-dev/tox/issues/1343>`_

3.14.5

--------------------

Features
^^^^^^^^

- Add ``--discover`` (fallback to ``TOX_DISCOVER`` environment variable via path separator) to inject python executables
to try as first step of a discovery - note the executable still needs to match the environment by :user:`gaborbernat`.
`1526 <https://github.com/tox-dev/tox/issues/1526>`_

3.14.4

--------------------

Bugfixes
^^^^^^^^

- Bump minimal six version needed to avoid using one incompatible with newer
virtualenv. - by :user:`ssbarnea`
`1519 <https://github.com/tox-dev/tox/issues/1519>`_
- Avoid pypy test failure due to undefined printout var. - by :user:`ssbarnea`
`1521 <https://github.com/tox-dev/tox/issues/1521>`_


Features
^^^^^^^^

- Add ``interrupt_timeout`` and ``terminate_timeout`` that configure delay between SIGINT, SIGTERM and SIGKILL when tox is interrupted. - by :user:`sileht`
`1493 <https://github.com/tox-dev/tox/issues/1493>`_
- Add ``HTTP_PROXY``, ``HTTPS_PROXY`` and ``NO_PROXY`` to default passenv. - by :user:`pfmoore`
`1498 <https://github.com/tox-dev/tox/issues/1498>`_

Links

• PyPI: https://pypi.org/project/tox
• Changelog: https://pyup.io/changelogs/tox/
• Docs: http://tox.readthedocs.org

[coveralls]

Coverage remained the same at 42.065% when pulling 6268d18 on pyup-update-tox-3.14.3-to-3.23.0 into 10a4d82 on master.

[pyup-bot]

Closing this in favor of #600