Add a note, that bootstrap script can't install pip.

[jedie]

See also: #656

[jedie]

Maybe someone can write it in "better words" ;)

[pfmoore]

Thanks for the PR, but I don't think the wording is quite accurate. What I would say:

A bootstrap script requires a virtualenv_support directory containing pip and setuptools wheels alongside it, just like the actual virtualenv script. Running a bootstrap script without a virtualenv_support directory is unsupported (but if you use --no-setuptools and manually install pip and setuptools in your virtualenv, it will work).

[pfmoore]

Sorry, I missed your second comment when I wrote mine. I hope my wording suits you. If you don't want to update your PR, I'll do one myself (but it might take me a few days).

[BrownTruck]

Hello!

As part of an effort to ease the contribution process and adopt a more standard workflow virtualenv has switched to doing development on the master branch. However, this Pull Request was made against the develop branch so it will need to be resubmitted against master.

If you do nothing, this Pull Request will be automatically migrated by @BrownTruck for you.

If you would like to retain control over this pull request then you should resubmit it against the master branch, closing and referencing the original Pull Request.

If you choose to migrate this Pull Request yourself, here is an example message that you can copy and paste:

See also: #656

---

*This was migrated from pypa/virtualenv#657 to reparent it to the ``master`` branch. Please see original pull request for any previous discussion.*

If this pull request is no longer needed, please feel free to close it.

[BrownTruck]

This Pull Request has been automatically migrated to #914 to reparent it to the master branch. Please see the new pull request for any new discussion.