[Checkins] [zopefoundation/zope.security] 9f9b41: Fix test failure on Python 3.7

[GitHub]

  Branch: refs/heads/py37
  Home:   https://github.com/zopefoundation/zope.security
  Commit: 9f9b4106a10557dcdd621a67be7cb90e5d17e98f
      https://github.com/zopefoundation/zope.security/commit/9f9b4106a10557dcdd621a67be7cb90e5d17e98f
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2018-08-08 (Wed, 08 Aug 2018)

  Changed paths:
    M docs/proxy.rst

  Log Message:
  -----------
  Fix test failure on Python 3.7

ABCMeta._abc_invalidation_counter is no more.

The test passes if we don't touch it, so we're all good?  There are no
more hidden caches we need to worry about?  Anybody want to dig into
this deeper?



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