Update pip to 19.2.1

[pyup-bot]

This PR updates pip from 19.0.3 to 19.2.1.

Changelog

19.2

=================

Deprecations and Removals
-------------------------

- Drop support for EOL Python 3.4. (`6685 <https://github.com/pypa/pip/issues/6685>`_)
- Improve deprecation messages to include the version in which the functionality will be removed. (`6549 <https://github.com/pypa/pip/issues/6549>`_)

Features
--------

- Credentials will now be loaded using `keyring` when installed. (`5948 <https://github.com/pypa/pip/issues/5948>`_)
- Fully support using ``--trusted-host`` inside requirements files. (`3799 <https://github.com/pypa/pip/issues/3799>`_)
- Update timestamps in pip's ``--log`` file to include milliseconds. (`6587 <https://github.com/pypa/pip/issues/6587>`_)
- Respect whether a file has been marked as "yanked" from a simple repository
(see `PEP 592 <https://www.python.org/dev/peps/pep-0592/>`__ for details). (`6633 <https://github.com/pypa/pip/issues/6633>`_)
- When choosing candidates to install, prefer candidates with a hash matching
one of the user-provided hashes. (`5874 <https://github.com/pypa/pip/issues/5874>`_)
- Improve the error message when ``METADATA`` or ``PKG-INFO`` is None when
accessing metadata. (`5082 <https://github.com/pypa/pip/issues/5082>`_)
- Add a new command ``pip debug`` that can display e.g. the list of compatible
tags for the current Python. (`6638 <https://github.com/pypa/pip/issues/6638>`_)
- Display hint on installing with --pre when search results include pre-release versions. (`5169 <https://github.com/pypa/pip/issues/5169>`_)
- Report to Warehouse that pip is running under CI if the ``PIP_IS_CI`` environment variable is set. (`5499 <https://github.com/pypa/pip/issues/5499>`_)
- Allow ``--python-version`` to be passed as a dotted version string (e.g.
``3.7`` or ``3.7.3``). (`6585 <https://github.com/pypa/pip/issues/6585>`_)
- Log the final filename and SHA256 of a ``.whl`` file when done building a
wheel. (`5908 <https://github.com/pypa/pip/issues/5908>`_)
- Include the wheel's tags in the log message explanation when a candidate
wheel link is found incompatible. (`6121 <https://github.com/pypa/pip/issues/6121>`_)
- Add a ``--path`` argument to ``pip freeze`` to support ``--target``
installations. (`6404 <https://github.com/pypa/pip/issues/6404>`_)
- Add a ``--path`` argument to ``pip list`` to support ``--target``
installations. (`6551 <https://github.com/pypa/pip/issues/6551>`_)

Bug Fixes
---------

- Set ``sys.argv[0]`` to the underlying ``setup.py`` when invoking ``setup.py``
via the setuptools shim so setuptools doesn't think the path is ``-c``. (`1890 <https://github.com/pypa/pip/issues/1890>`_)
- Update ``pip download`` to respect the given ``--python-version`` when checking
``"Requires-Python"``. (`5369 <https://github.com/pypa/pip/issues/5369>`_)
- Respect ``--global-option`` and ``--install-option`` when installing from
a version control url (e.g. ``git``). (`5518 <https://github.com/pypa/pip/issues/5518>`_)
- Make the "ascii" progress bar really be "ascii" and not Unicode. (`5671 <https://github.com/pypa/pip/issues/5671>`_)
- Fail elegantly when trying to set an incorrectly formatted key in config. (`5963 <https://github.com/pypa/pip/issues/5963>`_)
- Prevent DistutilsOptionError when prefix is indicated in the global environment and `--target` is used. (`6008 <https://github.com/pypa/pip/issues/6008>`_)
- Fix ``pip install`` to respect ``--ignore-requires-python`` when evaluating
links. (`6371 <https://github.com/pypa/pip/issues/6371>`_)
- Fix a debug log message when freezing an editable, non-version controlled
requirement. (`6383 <https://github.com/pypa/pip/issues/6383>`_)
- Extend to Subversion 1.8+ the behavior of calling Subversion in
interactive mode when pip is run interactively. (`6386 <https://github.com/pypa/pip/issues/6386>`_)
- Prevent ``pip install <url>`` from permitting directory traversal if e.g.
a malicious server sends a ``Content-Disposition`` header with a filename
containing ``../`` or ``..\\``. (`6413 <https://github.com/pypa/pip/issues/6413>`_)
- Hide passwords in output when using ``--find-links``. (`6489 <https://github.com/pypa/pip/issues/6489>`_)
- Include more details in the log message if ``pip freeze`` can't generate a
requirement string for a particular distribution. (`6513 <https://github.com/pypa/pip/issues/6513>`_)
- Add the line number and file location to the error message when reading an
invalid requirements file in certain situations. (`6527 <https://github.com/pypa/pip/issues/6527>`_)
- Prefer ``os.confstr`` to ``ctypes`` when extracting glibc version info. (`6543 <https://github.com/pypa/pip/issues/6543>`_, `6675 <https://github.com/pypa/pip/issues/6675>`_)
- Improve error message printed when an invalid editable requirement is provided. (`6648 <https://github.com/pypa/pip/issues/6648>`_)
- Improve error message formatting when a command errors out in a subprocess. (`6651 <https://github.com/pypa/pip/issues/6651>`_)

Vendored Libraries
------------------

- Upgrade certifi to 2019.6.16
- Upgrade distlib to 0.2.9.post0
- Upgrade msgpack to 0.6.1
- Upgrade requests to 2.22.0
- Upgrade urllib3 to 1.25.3
- Patch vendored html5lib, to prefer using `collections.abc` where possible.

Improved Documentation
----------------------

- Document how Python 2.7 support will be maintained. (`6726 <https://github.com/pypa/pip/issues/6726>`_)
- Upgrade Sphinx version used to build documentation. (`6471 <https://github.com/pypa/pip/issues/6471>`_)
- Fix generation of subcommand manpages. (`6724 <https://github.com/pypa/pip/issues/6724>`_)
- Mention that pip can install from git refs. (`6512 <https://github.com/pypa/pip/issues/6512>`_)
- Replace a failing example of pip installs with extras with a working one. (`4733 <https://github.com/pypa/pip/issues/4733>`_)

19.1.1

===================

Features
--------

- Restore ``pyproject.toml`` handling to how it was with pip 19.0.3 to prevent
the need to add ``--no-use-pep517`` when installing in editable mode. (`6434 <https://github.com/pypa/pip/issues/6434>`_)

Bug Fixes
---------

- Fix a regression that caused `` to be quoted in pypiserver links.
This interfered with parsing the revision string from VCS urls. (`6440 <https://github.com/pypa/pip/issues/6440>`_)

19.1

=================

Features
--------

- Configuration files may now also be stored under ``sys.prefix`` (`5060 <https://github.com/pypa/pip/issues/5060>`_)
- Avoid creating an unnecessary local clone of a Bazaar branch when exporting. (`5443 <https://github.com/pypa/pip/issues/5443>`_)
- Include in pip's User-Agent string whether it looks like pip is running
under CI. (`5499 <https://github.com/pypa/pip/issues/5499>`_)
- A custom (JSON-encoded) string can now be added to pip's User-Agent
using the ``PIP_USER_AGENT_USER_DATA`` environment variable. (`5549 <https://github.com/pypa/pip/issues/5549>`_)
- For consistency, passing ``--no-cache-dir`` no longer affects whether wheels
will be built.  In this case, a temporary directory is used. (`5749 <https://github.com/pypa/pip/issues/5749>`_)
- Command arguments in ``subprocess`` log messages are now quoted using
``shlex.quote()``. (`6290 <https://github.com/pypa/pip/issues/6290>`_)
- Prefix warning and error messages in log output with `WARNING` and `ERROR`. (`6298 <https://github.com/pypa/pip/issues/6298>`_)
- Using ``--build-options`` in a PEP 517 build now fails with an error,
rather than silently ignoring the option. (`6305 <https://github.com/pypa/pip/issues/6305>`_)
- Error out with an informative message if one tries to install a
``pyproject.toml``-style (PEP 517) source tree using ``--editable`` mode. (`6314 <https://github.com/pypa/pip/issues/6314>`_)
- When downloading a package, the ETA and average speed now only update once per second for better legibility. (`6319 <https://github.com/pypa/pip/issues/6319>`_)

Bug Fixes
---------

- The stdout and stderr from VCS commands run by pip as subprocesses (e.g.
``git``, ``hg``, etc.) no longer pollute pip's stdout. (`1219 <https://github.com/pypa/pip/issues/1219>`_)
- Fix handling of requests exceptions when dependencies are debundled. (`4195 <https://github.com/pypa/pip/issues/4195>`_)
- Make pip's self version check avoid recommending upgrades to prereleases if the currently-installed version is stable. (`5175 <https://github.com/pypa/pip/issues/5175>`_)
- Fixed crash when installing a requirement from a URL that comes from a dependency without a URL. (`5889 <https://github.com/pypa/pip/issues/5889>`_)
- Improve handling of file URIs: correctly handle `file://localhost/...` and don't try to use UNC paths on Unix. (`5892 <https://github.com/pypa/pip/issues/5892>`_)
- Fix ``utils.encoding.auto_decode()`` ``LookupError`` with invalid encodings.
``utils.encoding.auto_decode()`` was broken when decoding Big Endian BOM
byte-strings on Little Endian or vice versa. (`6054 <https://github.com/pypa/pip/issues/6054>`_)
- Fix incorrect URL quoting of IPv6 addresses. (`6285 <https://github.com/pypa/pip/issues/6285>`_)
- Redact the password from the extra index URL when using ``pip -v``. (`6295 <https://github.com/pypa/pip/issues/6295>`_)
- The spinner no longer displays a completion message after subprocess calls
not needing a spinner. It also no longer incorrectly reports an error after
certain subprocess calls to Git that succeeded. (`6312 <https://github.com/pypa/pip/issues/6312>`_)
- Fix the handling of editable mode during installs when ``pyproject.toml`` is
present but PEP 517 doesn't require the source tree to be treated as
``pyproject.toml``-style. (`6370 <https://github.com/pypa/pip/issues/6370>`_)
- Fix ``NameError`` when handling an invalid requirement. (`6419 <https://github.com/pypa/pip/issues/6419>`_)

Vendored Libraries
------------------

- Updated certifi to 2019.3.9
- Updated distro to 1.4.0
- Update progress to 1.5
- Updated pyparsing to 2.4.0
- Updated pkg_resources to 41.0.1 (via setuptools)

Improved Documentation
----------------------

- Make dashes render correctly when displaying long options like
``--find-links`` in the text. (`6422 <https://github.com/pypa/pip/issues/6422>`_)

Links

• PyPI: https://pypi.org/project/pip
• Changelog: https://pyup.io/changelogs/pip/
• Homepage: https://pip.pypa.io/

[pyup-bot]

Closing this in favor of #39