[Checkins] [zopefoundation/Zope] 904ec5: Release 5.0a1.

[Michael Howitz]

  Branch: refs/heads/gh-pages
  Home:   https://github.com/zopefoundation/Zope
  Commit: 904ec57eba93782fad4cedf2e266c43089a5a866
      https://github.com/zopefoundation/Zope/commit/904ec57eba93782fad4cedf2e266c43089a5a866
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-02-28 (Fri, 28 Feb 2020)

  Changed paths:
    M README.md
    M build_index.py
    M releases/4.x/constraints.txt
    M releases/4.x/requirements-full.txt
    M releases/4.x/versions-prod.cfg
    M releases/4.x/versions.cfg
    A releases/5.0a1/constraints.txt
    A releases/5.0a1/requirements-full.txt
    A releases/5.0a1/versions-prod.cfg
    A releases/5.0a1/versions.cfg

  Log Message:
  -----------
  Release 5.0a1.