Bump virtualenv from 20.0.6 to 20.0.21

[dependabot-preview]

Bumps virtualenv from 20.0.6 to 20.0.21.

Changelog

Sourced from virtualenv's changelog.

v20.0.21 (2020-05-20)

Features - 20.0.21

• Generate ignore file for version control systems to avoid tracking virtual environments by default. Users should remove these files if still want to track. For now we support only git by gaborbernat. (#1806)

Bugfixes - 20.0.21

• Fix virtualenv fails sometimes when run concurrently, --clear-app-data conflicts with clear flag when abbreviation is turned on. To bypass this while allowing abbreviated flags on the command line we had to move it to reset-app-data - by gaborbernat. (#1824)
• Upgrade embeded setuptools to 46.4.0 from 46.1.3 on Python 3.5+, and pip from 20.1 to 20.1.1 - by gaborbernat. (#1827)
• Seeder pip now correctly handles --extra-search-dir - by frenzymadness. (#1834)

v20.0.20 (2020-05-04)

Bugfixes - 20.0.20

• Fix download fails with python 3.4 - by gaborbernat. (#1809)
• Fixes older CPython2 versions use _get_makefile_filename instead of get_makefile_filename on sysconfig - by ianw. (#1810)
• Fix download is True by default - by gaborbernat. (#1813)
• Fail app-data seed operation when wheel download fails and better error message - by gaborbernat. (#1814)

v20.0.19 (2020-05-03)

Bugfixes - 20.0.19

• Fix generating a Python 2 environment from Python 3 creates invalid python activator - by gaborbernat. (#1776)
• Fix pinning seed packages via app-data seeder raised Invalid Requirement - by gaborbernat. (#1779)
• Do not stop interpreter discovery if we fail to find the system interpreter for a executable during discovery
  • by gaborbernat. (#1781)
• On CPython2 POSIX platforms ensure syconfig.get_makefile_filename exists within the virtual environment (this is used by some c-extension based libraries - e.g. numpy - for building) - by gaborbernat. (#1783)
• Better handling of options copies and symlinks. Introduce priority of where the option is set to follow the order: CLI, env var, file, hardcoded. If both set at same level prefers copy over symlink. - by gaborbernat. (#1784)
• Upgrade pip for Python 2.7 and 3.5+ from 20.0.2 to 20.1 - by gaborbernat. (#1793)
• Fix CPython is not discovered from Windows registry, and discover pythons from Windows registry in decreasing order by version - by gaborbernat. (#1796)
• Fix symlink detection for creators - by asottile (#1803)

v20.0.18 (2020-04-16)

Bugfixes - 20.0.18

• Importing setuptools before cli_run could cause our python information query to fail due to setuptools patching distutils.dist.Distribution - by gaborbernat. (#1771)

... (truncated)

Commits

• 64ca39f release 20.0.21
• cab770c Fix pip seeder with --extra-search-dir specified (#1835)
• 078ed06 Upgrade pip and setuptools (#1836)
• 8f97913 Bump setuptools (#1828)
• e36a6c4 Rename clear-app-data to reset-app-data to avoid cli parser abbreviation bug ...
• 31f3752 Upgrade embeded setuptools to 46.3.0 (#1827)
• 06223ad Mark virtual environments ignored for Git (#1825)
• 11d922b Bump linters (#1823)
• b8ded22 Merge pull request #1815 from pypa/release-20.0.20
• 768468e release 20.0.20
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[codecov-commenter]

Codecov Report

Merging #495 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #495   +/-   ##
=======================================
  Coverage   90.84%   90.84%           
=======================================
  Files          50       50           
  Lines        6966     6966           
  Branches     1326     1326           
=======================================
  Hits         6328     6328           
  Misses        478      478           
  Partials      160      160           

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