[Checkins] [zopefoundation/zope.pluggableauth] 0ebe4c: Fix invalid escape sequences warning in Python 3.7

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.pluggableauth
  Commit: 0ebe4c5ec4fd5b1f1928637320ec742ec1cab77a
      https://github.com/zopefoundation/zope.pluggableauth/commit/0ebe4c5ec4fd5b1f1928637320ec742ec1cab77a
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-12-04 (Wed, 04 Dec 2019)

  Changed paths:
    M src/zope/pluggableauth/factories.py

  Log Message:
  -----------
  Fix invalid escape sequences warning in Python 3.7