Bump pip from 19.0.1 to 20.2.1

[dependabot-preview]

Bumps pip from 19.0.1 to 20.2.1.

Changelog

Sourced from pip's changelog.

20.2.1 (2020-08-04)

Features

• Ignore require-virtualenv in pip list (#8603)

Bug Fixes

• Correctly find already-installed distributions with dot (.) in the name and uninstall them when needed. (#8645)
• Trace a better error message on installation failure due to invalid .data files in wheels. (#8654)
• Fix SVN version detection for alternative SVN distributions. (#8665)
• New resolver: Correctly include the base package when specified with extras in --no-deps mode. (#8677)
• Use UTF-8 to handle ZIP archive entries on Python 2 according to PEP 427, so non-ASCII paths can be resolved as expected. (#8684)

Improved Documentation

• Add details on old resolver deprecation and removal to migration documentation. (#8371)
• Fix feature flag name in docs. (#8660)

20.2 (2020-07-29)

Deprecations and Removals

• Deprecate setup.py-based builds that do not generate an .egg-info directory. (#6998, #8617)
• Disallow passing install-location-related arguments in --install-options. (#7309)
• Add deprecation warning for invalid requirements format "base>=1.0[extra]" (#8288)
• Deprecate legacy setup.py install when building a wheel failed for source distributions without pyproject.toml (#8368)
• Deprecate -b/--build/--build-dir/--build-directory. Its current behaviour is confusing and breaks in case different versions of the same distribution need to be built during the resolution process. Using the TMPDIR/TEMP/TMP environment variable, possibly combined with --no-clean covers known use cases. (#8372)
• Remove undocumented and deprecated option --always-unzip (#8408)

Features

• Log debugging information about pip, in pip install --verbose. (#3166)

• Refine error messages to avoid showing Python tracebacks when an HTTP error occurs. (#5380)

• Install wheel files directly instead of extracting them to a temp directory. (#6030)

• Add a beta version of pip's next-generation dependency resolver.

  Move pip's new resolver into beta, remove the --unstable-feature=resolver flag, and enable the --use-feature=2020-resolver flag. The new resolver is significantly stricter and more consistent when it receives incompatible instructions, and reduces support for certain kinds of Constraints Files, so some workarounds and workflows may break. More details about how to test and migrate, and how to report issues, at Resolver changes 2020 . Maintainers are preparing to release pip 20.3, with the new resolver on by default, in October. (#6536)

• Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (#8546, #8377)

• Add a subcommand debug to pip config to list available configuration sources and the key-value pairs defined in them. (#6741)

• Warn if index pages have unexpected content-type (#6754)

• Allow specifying --prefer-binary option in a requirements file (#7693)

• Generate PEP 376 REQUESTED metadata for user supplied requirements installed by pip. (#7811)

Commits

• fa2714f Bump for release
• 02ad77d Merge pull request #8603 from tekumara/pip-list-ignore-require-venv
• 6eea0d0 Merge pull request #8660 from brainwane/update-flag-in-docs
• 22d67dc Merge pull request #8665 from uranusjr/svn-version-more-robust
• 864e2ee Merge pull request #8659 from uranusjr/fix-get-distribution-dot-in-name
• ed205bd Merge pull request #8656 from chrahunt/gracefully-handle-bad-data-paths
• 552b837 Merge pull request #8678 from uranusjr/new-resolver-no-deps-extras-install-self
• 4a39344 Merge pull request #8688 from brainwane/deprecation-opt-in-resolver
• b29dd4e Merge pull request #8679 from pradyunsg/tweak-resolutionimpossible-message
• 527b3e2 Merge pull request #8684 from uranusjr/zipfile-unicode-path-python2
• 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 use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @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 your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[dependabot-preview]

Superseded by #547.