Fix get-pip which dropped support for legacy Python
Fix get-pip which dropped support for legacy Python

Fix pyenv to continue to support legacy Python builds despite the fact that `get-pip` has dropped support for Python 2 as discussed in pypa/get-pip#87
sebhahn/pyenv,pyenv/pyenv,sebhahn/pyenv,yyuu/pyenv,sebhahn/pyenv,pyenv/pyenv,yyuu/pyenv,pyenv/pyenv