GET_PIP_URLs for python 2.7, 3.4, and 3.5 are incorrect

[adamwallred]

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Description

• Platform information (e.g. Ubuntu Linux 16.04): CentOS 7 (and maybe others)
• OS architecture (e.g. amd64): amd64
• pyenv version: 1.2.23
• Python version: 2.7, 3.4, 3.5
• C Compiler information (e.g. gcc 7.3): N/A
• Please attach verbose build log as gist

I think the fix for get-pip.py adding python 2.7, 3.4, and 3.5 GET_PIP_URLs (in #1793) points to invalid URLs:

Going to https://bootstrap.pypa.io/2.7/get-pip.py , one gets shown:

#!/usr/bin/env python
from __future__ import print_function
import sys
import textwrap

message = """
Hi there!

The URL you are using to fetch this script has changed, and this one will no
longer work. Please use get-pip.py from the following URL instead:

    https://bootstrap.pypa.io/pip/2.7/get-pip.py

Sorry if this change causes any inconvenience for you!

We don't have a good mechanism to make more gradual changes here, and this
renaming is a part of an effort to make it easier to us to update these
scripts, when there's a pip release. It's also essential for improving how we
handle the `get-pip.py` scripts, when pip drops support for a Python minor
version.

There are no more renames/URL changes planned, and we don't expect that a need
would arise to do this again in the near future.

Thanks for understanding!

- Pradyun, on behalf of the volunteers who maintain pip.
"""

print(message, file=sys.stderr)
sys.exit(1)

Setting GET_PIP_URL to https://bootstrap.pypa.io/pip/2.7/get-pip.py when running pyenv install 2.7.x appears to work.

[adamwallred]

Apologies, it was fixed in #1844 . Closing.