[Checkins] [zopefoundation/persistent] 8c3953: Use unsigned integers to represent addresses

[Jerry James]

  Branch: refs/heads/issue137
  Home:   https://github.com/zopefoundation/persistent
  Commit: 8c39538294bbc93a2940e51632c477c9a370cea8
      https://github.com/zopefoundation/persistent/commit/8c39538294bbc93a2940e51632c477c9a370cea8
  Author: Jerry James <loganjerry at gmail.com>
  Date:   2020-03-18 (Wed, 18 Mar 2020)

  Changed paths:
    M CHANGES.rst
    M persistent/_ring_build.py
    M persistent/ring.py

  Log Message:
  -----------
  Use unsigned integers to represent addresses

Add change note.

Fixes #137