[Checkins] [zopefoundation/AccessControl] 62fc39: Update appveyor.yml

[Michael Howitz]

  Branch: refs/heads/fix-81
  Home:   https://github.com/zopefoundation/AccessControl
  Commit: 62fc39a93341000b258043bc88180f0d025514cc
      https://github.com/zopefoundation/AccessControl/commit/62fc39a93341000b258043bc88180f0d025514cc
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-05-08 (Wed, 08 May 2019)

  Changed paths:
    M appveyor.yml

  Log Message:
  -----------
  Update appveyor.yml