[Checkins] [zopefoundation/zope.interface] b749fc: C optimizations: Spec_clear and Spec_traverse need...

[Jason Madden]

  Branch: refs/heads/issue216
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: b749fc0f17ee628b9ef7bb8afd14b6bf51414bff
      https://github.com/zopefoundation/zope.interface/commit/b749fc0f17ee628b9ef7bb8afd14b6bf51414bff
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2020-09-28 (Mon, 28 Sep 2020)

  Changed paths:
    M CHANGES.rst
    M src/zope/interface/_zope_interface_coptimizations.c
    M src/zope/interface/tests/test_declarations.py

  Log Message:
  -----------
  C optimizations: Spec_clear and Spec_traverse need to include Spec->_bases

Previously they did not, leading to a reference leak of a tuple.

Fixes #216