[Checkins] [zopefoundation/ExtensionClass] 42c4b8: - tweaks to appveyor config

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/ExtensionClass
  Commit: 42c4b8e27003323f41412f441ac9603955087dc8
      https://github.com/zopefoundation/ExtensionClass/commit/42c4b8e27003323f41412f441ac9603955087dc8
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2017-11-27 (Mon, 27 Nov 2017)

  Changed paths:
    M appveyor.yml

  Log Message:
  -----------
  - tweaks to appveyor config