Plugin broken/no longer required on latest pyenv

[j616]

The latest update to pyenv has added native support for installing the latest python version for a given prefix. At the same time, it has made use of the python latest command for a different purpose. Details here https://github.com/pyenv/pyenv#prefix-auto-resolution

Using this plugin is now no longer required with pyenv and will fail with the following error if used

pyenv: no installed versions match the prefix `install'

The "fix" for users is to uninstall this plugin and to change instances of the install command to remove the latest keyword.