Update get-pipenv.py to use up-to-date pip

Links:

• get-pipenv.py;
• documentation describing its usage.

The issue is that get-pipenv.py at the moment contains pip==9.0.1 which is a little bit outdated. New releases of pip contain a lot of bug fixes (see changelog).

I understand that this script is used only once to bootstrap the system, but anyway it’s better to use an up-to-date version.

If you think that it’s worth updating, then I would be happy to provide a PR.

[frostming]

I had a look at get-pip.py and realized that it can be used to install other packages than pip, setuptools and wheel.

Can you please try the following command to see if it works?

$ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
$ python get-pip.py pipenv

If so, we just remove that file and update the documentation.

[oz123]

Fixed in #4920 .