Log Message:
py-pip: updated to 20.2.1

20.2.1
======

Features
--------
- Ignore require-virtualenv in ``pip list``

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

Improved Documentation
----------------------
- Add details on old resolver deprecation and removal to migration documentation.
- Fix feature flag name in docs.