Update pip to 10.0.1

[pyup-bot]

This PR updates pip from 10.0.0 to 10.0.1.

Changelog

10.0.1

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

Features
--------

- Switch the default repository to the new "PyPI 2.0" running at
https://pypi.org/. (5214)

Bug Fixes
---------

- Fix a bug that made get-pip.py unusable on Windows without renaming. (5219)
- Fix a TypeError when loading the cache on older versions of Python 2.7.
(5231)
- Fix and improve error message when EnvironmentError occurs during
installation. (5237)
- A crash when reinstalling from VCS requirements has been fixed. (5251)
- Fix PEP 518 support when pip is installed in the user site. (5524)

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

- Upgrade distlib to 0.2.7

Links

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