Deprecation warning on bare variables

[yujunz]

TASK [pyenv : Install versions] ************************************************
task path: /Users/yujunz/Develop/denv/roles/pyenv/tasks/main.yml:4
[DEPRECATION WARNING]: Using bare variables is deprecated. Update your playbooks so that the environment value uses the full variable syntax ('{{pyenv_versions}}').
This feature
will be removed in a future release. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.

[dylanninin]

duplicated