Bump virtualenv from 20.0.35 to 20.4.0

[dependabot-preview]

Bumps virtualenv from 20.0.35 to 20.4.0.

Changelog

Sourced from virtualenv's changelog.

v20.4.0 (2021-01-19)

Features - 20.4.0

• On the programmatic API allow passing in the environment variable dictionary to use, defaults to os.environ if not specified - by gaborbernat. (#2054)

Bugfixes - 20.4.0

• Upgrade embedded setuptools to 51.3.3 from 51.1.2 - by gaborbernat. (#2055)

v20.3.1 (2021-01-13)

Bugfixes - 20.3.1

• Bump embed pip to 20.3.3, setuptools to 51.1.1 and wheel to 0.36.2 - by gaborbernat. (#2036)
• Allow unfunctioning of pydoc to fail freely so that virtualenvs can be activated under Zsh with set -e (since otherwise unset -f and unfunction exit with 1 if the function does not exist in Zsh) - by d125q. (#2049)
• Drop cached python information if the system executable is no longer present (for example when the executable is a shim and the mapped executable is replaced - such is the case with pyenv) - by gaborbernat. (#2050)

v20.3.0 (2021-01-10)

Features - 20.3.0

• The builtin discovery takes now a --try-first-with argument and is first attempted as valid interpreters. One can use this to force discovery of a given python executable when the discovery order/mechanism raises errors -by gaborbernat. (#2046)

Bugfixes - 20.3.0

• On Windows python 3.7+ distributions where the exe shim is missing fallback to the old ways - by gaborbernat. (#1986)
• When discovering interpreters on Windows, via the PEP-514, prefer PythonCore releases over other ones. virtualenv is used via pip mostly by this distribution, so prefer it over other such as conda - by gaborbernat. (#2046)

v20.2.2 (2020-12-07)

Bugfixes - 20.2.2

• Bump pip to 20.3.1, setuptools to 51.0.0 and wheel to 0.36.1 - by gaborbernat. (#2029)

v20.2.1 (2020-11-23)

No significant changes.

... (truncated)

Commits

• d47e0a5 release 20.4.0
• a9b0f3b Fix Windows failure (#2056)
• 40aec48 API: Allow passing on the environment variable as an argument (#2054)
• 4c95506 Upgrade embedded setuptools to 51.3.3 from 51.1.2 (#2055)
• 7185e57 Merge pull request #2051 from pypa/release-20.3.1
• 395696d release 20.3.1
• 7f83442 Clear stash if system executable is missing (#2050)
• 39fdf95 Bump pip to 20.3.3 and wheel to 0.36.2 (#2036)
• 26943f6 Allow unfunctioing pydoc to fail (#2049)
• a4025d6 release 20.3.0
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in the .dependabot/config.yml file in this repo:

• Update frequency
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[dependabot-preview]

Superseded by #278.