Bump virtualenv from 20.0.18 to 20.0.19

[dependabot-preview]

Bumps virtualenv from 20.0.18 to 20.0.19.

Changelog

Sourced from virtualenv's changelog.

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)

Commits

• 1338f7c release 20.0.19
• 19fc7bc Fix python 2 activator when generated from python 3 is invalid (#1805)
• 481e395 Fix CPython2 not found on Windows via registry (#1797)
• 77f956e adjust gitignore to cover tests/unit/seed/greet/greet.egg-info (#1804)
• 45188a7 Fix typo in symlink detection (#1803)
• 3dfa4fd make test discovery more deterministic (#1802)
• bb7bb71 Run tests in randome order (#1799)
• 18de796 Bump pip to 20.1 (#1795)
• 43e4b1e Fix macOS supported list rendering (#1791)
• 4ddf643 Handle poison interpreters during discovery (#1790)
• Additional commits viewable in compare view

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[codecov-io]

Codecov Report

Merging #30 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #30   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          289       289           
  Branches        70        70           
=========================================
  Hits           289       289           

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[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.