Bump pip from 20.1.1 to 20.2 in /.github/workflows

[cjolowicz]

Bumps pip from 20.1.1 to 20.2.

Changelog

Sourced from pip's changelog.

20.2 (2020-07-29)

Deprecations and Removals

• Deprecate setup.py-based builds that do not generate an .egg-info directory. ([#6998](https://github.com/pypa/pip/issues/6998) <https://github.com/pypa/pip/issues/6998>, [#8617](https://github.com/pypa/pip/issues/8617) <https://github.com/pypa/pip/issues/8617>)
• Disallow passing install-location-related arguments in --install-options. ([#7309](https://github.com/pypa/pip/issues/7309) <https://github.com/pypa/pip/issues/7309>_)
• Add deprecation warning for invalid requirements format "base>=1.0[extra]" ([#8288](https://github.com/pypa/pip/issues/8288) <https://github.com/pypa/pip/issues/8288>_)
• Deprecate legacy setup.py install when building a wheel failed for source distributions without pyproject.toml ([#8368](https://github.com/pypa/pip/issues/8368) <https://github.com/pypa/pip/issues/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](https://github.com/pypa/pip/issues/8372) <https://github.com/pypa/pip/issues/8372>_)
• Remove undocumented and deprecated option --always-unzip ([#8408](https://github.com/pypa/pip/issues/8408) <https://github.com/pypa/pip/issues/8408>_)

Features

• Log debugging information about pip, in pip install --verbose. ([#3166](https://github.com/pypa/pip/issues/3166) <https://github.com/pypa/pip/issues/3166>_)

• Refine error messages to avoid showing Python tracebacks when an HTTP error occurs. ([#5380](https://github.com/pypa/pip/issues/5380) <https://github.com/pypa/pip/issues/5380>_)

• Install wheel files directly instead of extracting them to a temp directory. ([#6030](https://github.com/pypa/pip/issues/6030) <https://github.com/pypa/pip/issues/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 :ref:Constraints Files, so some workarounds and workflows may break. More details about how to test and migrate, and how to report issues, at :ref:Resolver changes 2020 . Maintainers are preparing to release pip 20.3, with the new resolver on by default, in October. ([#6536](https://github.com/pypa/pip/issues/6536) <https://github.com/pypa/pip/issues/6536>_)

• Add a subcommand debug to pip config to list available configuration sources and the key-value pairs defined in them. ([#6741](https://github.com/pypa/pip/issues/6741) <https://github.com/pypa/pip/issues/6741>_)

• Warn if index pages have unexpected content-type ([#6754](https://github.com/pypa/pip/issues/6754) <https://github.com/pypa/pip/issues/6754>_)

• Allow specifying --prefer-binary option in a requirements file ([#7693](https://github.com/pypa/pip/issues/7693) <https://github.com/pypa/pip/issues/7693>_)

• Generate PEP 376 REQUESTED metadata for user supplied requirements installed by pip. ([#7811](https://github.com/pypa/pip/issues/7811) <https://github.com/pypa/pip/issues/7811>_)

• Warn if package url is a vcs or an archive url with invalid scheme ([#8128](https://github.com/pypa/pip/issues/8128) <https://github.com/pypa/pip/issues/8128>_)

• Parallelize network operations in pip list. ([#8504](https://github.com/pypa/pip/issues/8504) <https://github.com/pypa/pip/issues/8504>_)

• Allow the new resolver to obtain dependency information through wheels lazily downloaded using HTTP range requests. To enable this feature, invoke pip with --use-feature=fast-deps. ([#8588](https://github.com/pypa/pip/issues/8588) <https://github.com/pypa/pip/issues/8588>_)

• Support --use-feature in requirements files ([#8601](https://github.com/pypa/pip/issues/8601) <https://github.com/pypa/pip/issues/8601>_)

Bug Fixes

• Use canonical package names while looking up already installed packages. ([#5021](https://github.com/pypa/pip/issues/5021) <https://github.com/pypa/pip/issues/5021>_)

Commits

• 127acd8 Bump for release
• 20dc509 Update AUTHORS.txt
• 5160a25 Merge pull request #8491 from brainwane/testing-guide-beta
• 66d39f9 Clarify on conflicts and multiplicity
• 263f85b formatting fix
• ec73620 formatting
• d374b0d Add changelog entry
• 1e5e544 Ref links and followup tips
• 223e379 WIP formatting
• 6bfbce0 WIP adding links to issues
• Additional commits viewable in compare view

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