The DeprecationWarning is raised for virtualenv's distutils. It is fixed already. Use latest virtualenv.
Links: https://github.com/pypa/virtualenv/pull/1289 https://virtualenv.pypa.io/en/latest/changes/#v16-4-0-2019-02-09 -- Inada Naoki <songofaca...@gmail.com> -- https://mail.python.org/mailman/listinfo/python-list
