[Checkins] [zopefoundation/ZConfig] f0c299: update to tolerate logging.Formatter validation

[Fred Drake]

  Branch: refs/heads/fd-python38
  Home:   https://github.com/zopefoundation/ZConfig
  Commit: f0c2990d35ac3c924ecc8be4a5c71c8e4abbd0e5
      https://github.com/zopefoundation/ZConfig/commit/f0c2990d35ac3c924ecc8be4a5c71c8e4abbd0e5
  Author: Fred Drake <fred.drake at keepertech.com>
  Date:   2019-09-17 (Tue, 17 Sep 2019)

  Changed paths:
    M ZConfig/components/logger/formatter.py
    M ZConfig/components/logger/tests/test_formatter.py

  Log Message:
  -----------
  update to tolerate logging.Formatter validation

- required to work with Python 3.8
- closes issue #69