Bump virtualenv from 20.0.20 to 20.0.31

[dependabot-preview]

Bumps virtualenv from 20.0.20 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 gaborbernat. (#1918)

v20.0.30 (2020-08-04)

Bugfixes - 20.0.30

• Upgrade pip to 20.2.1 and setuptools to 49.2.1 - by gaborbernat. (#1915)

v20.0.29 (2020-07-31)

Bugfixes - 20.0.29

• Upgrade embedded pip from version 20.1.2 to 20.2 - by gaborbernat. (#1909)

v20.0.28 (2020-07-24)

Bugfixes - 20.0.28

• Fix test suite failing if run from system Python - by gaborbernat. (#1882)
• Provide setup_logging flag to python API so that users can bypass logging handling if their application already performs this - by gaborbernat. (#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 gaborbernat. (#1905)

v20.0.27 (2020-07-15)

Bugfixes - 20.0.27

• No longer preimport threading to fix support for gpython and gevent - by navytux. (#1897)
• Upgrade setuptools from 49.2.0 on Python 3.5+ - by gaborbernat. (#1898)

v20.0.26 (2020-07-07)

Bugfixes - 20.0.26

• Bump dependency distutils >= 0.3.1 - by gaborbernat. (#1880)

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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