[Checkins] [zopefoundation/zope.container] 8a5922: Update the handling of PURE_PYTHON to match zope.i...

[Jason Madden]

  Branch: refs/heads/issue34
  Home:   https://github.com/zopefoundation/zope.container
  Commit: 8a5922769595fad3017d87e58c6cc5c9828a7ec9
      https://github.com/zopefoundation/zope.container/commit/8a5922769595fad3017d87e58c6cc5c9828a7ec9
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2020-04-01 (Wed, 01 Apr 2020)

  Changed paths:
    M .coveragerc
    M .gitignore
    M .travis.yml
    M CHANGES.rst
    M setup.py
    M src/zope/container/_proxy.py
    A src/zope/container/_util.py
    M src/zope/container/contained.py
    M src/zope/container/tests/test_contained.py
    M tox.ini
    M version.txt

  Log Message:
  -----------
  Update the handling of PURE_PYTHON to match zope.interface and persistent

Also stop using the deprecated, untested,
``zope.interafce.declarations.ObjectSpecification`` function in favor
of ``Provides``.