Log Message:
py-pip: updated to 19.0.2

19.0.2:

Bug Fixes
- Fix a crash where PEP 517-based builds using --no-cache-dir would fail in
  some circumstances with an AssertionError due to not finalizing a build
  directory internally.
- Provide a better error message if attempting an editable install of a
  directory with a pyproject.toml but no setup.py.
- The implicit default backend used for projects that provide a pyproject.toml
  file without explicitly specifying build-backend now behaves more like direct
  execution of setup.py, and hence should restore compatibility with projects
  that were unable to be installed with pip 19.0. This raised the minimum
  required version of setuptools for such builds to 40.8.0.
- Allow RECORD lines with more than three elements, and display a warning.
- AdjacentTempDirectory fails on unwritable directory instead of locking up the \ 
uninstall command.
- Make failed uninstalls roll back more reliably and better at avoiding naming \ 
conflicts.
- Ensure the correct wheel file is copied when building PEP 517 distribution is \ 
built.
- The Python 2 end of life warning now only shows on CPython, which is the
  implementation that has announced end of life plans.

Improved Documentation
- Re-write README and documentation index