build(deps): bump virtualenv from 20.0.26 to 20.0.31

[dependabot]

Bumps virtualenv from 20.0.26 to 20.0.31.

Changelog

Sourced from virtualenv's changelog.

v20.0.31 (2020-08-17)

Bugfixes - 20.0.31

- Upgrade embedded pip to ``20.2.1``, setuptools to ``49.6.0`` and wheel to ``0.35.1``  - by :user:`gaborbernat`. (`[#1918](https://github.com/pypa/virtualenv/issues/1918) <https://github.com/pypa/virtualenv/issues/1918>`_)
v20.0.30 (2020-08-04)
Bugfixes - 20.0.30

• Upgrade pip to 20.2.1 and setuptools to 49.2.1 - by :user:gaborbernat. ([#1915](https://github.com/pypa/virtualenv/issues/1915) <https://github.com/pypa/virtualenv/issues/1915>_)

v20.0.29 (2020-07-31)

Bugfixes - 20.0.29

- Upgrade embedded pip from version ``20.1.2`` to ``20.2`` - by :user:`gaborbernat`. (`[#1909](https://github.com/pypa/virtualenv/issues/1909) <https://github.com/pypa/virtualenv/issues/1909>`_)
v20.0.28 (2020-07-24)
Bugfixes - 20.0.28

• Fix test suite failing if run from system Python - by :user:gaborbernat. ([#1882](https://github.com/pypa/virtualenv/issues/1882) <https://github.com/pypa/virtualenv/issues/1882>_)
• Provide setup_logging flag to python API so that users can bypass logging handling if their application already performs this - by :user:gaborbernat. ([#1896](https://github.com/pypa/virtualenv/issues/1896) <https://github.com/pypa/virtualenv/issues/1896>_)
• Use \n instead if \r\n as line separator for report (because Python already performs this transformation automatically upon write to the logging pipe) - by :user:gaborbernat. ([#1905](https://github.com/pypa/virtualenv/issues/1905) <https://github.com/pypa/virtualenv/issues/1905>_)

v20.0.27 (2020-07-15)

Bugfixes - 20.0.27

- No longer preimport threading to fix support for `gpython <https://pypi.org/project/pygolang/#gpython>`_ and `gevent <https://www.gevent.org/>`_ - by :user:`navytux`. (`[#1897](https://github.com/pypa/virtualenv/issues/1897) <https://github.com/pypa/virtualenv/issues/1897>`_)
- Upgrade setuptools from ``49.2.0`` on ``Python 3.5+`` - by :user:`gaborbernat`. (`[#1898](https://github.com/pypa/virtualenv/issues/1898) <https://github.com/pypa/virtualenv/issues/1898>`_)

Commits

• 1dc5ebe release 20.0.31
• 5fd343f Upgrade pip and setuptools (#1918) (#1925)
• 13a0eac Merge pull request #1916 from pypa/release-20.0.30
• 2b6cc55 release 20.0.30
• 66a7ee1 Bump setuptools and pip (#1915)
• add8052 Merge pull request #1912 from pypa/release-20.0.29
• 283bfae release 20.0.29
• 6869f4a Update links to PSF CoC (#1911)
• 4168b6f Link to PyPa CoC page
• 0c0345a Update our code of conduct
• Additional commits viewable in compare view

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