[Checkins] [zopefoundation/Persistence] 10ec3b: Update pip for appveyor

[GitHub]

  Branch: refs/heads/python3.7support
  Home:   https://github.com/zopefoundation/Persistence
  Commit: 10ec3b4000c5b2ff1d0fe41d36d73b7327aa2c5c
      https://github.com/zopefoundation/Persistence/commit/10ec3b4000c5b2ff1d0fe41d36d73b7327aa2c5c
  Author: Jeremy Kolbe <jk at gocept.com>
  Date:   2018-10-02 (Tue, 02 Oct 2018)

  Changed paths:
    M appveyor.yml

  Log Message:
  -----------
  Update pip for appveyor



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