[Checkins] [zopefoundation/zope.sqlalchemy] b8e577: Fix external links in README

[Esa Varemo]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.sqlalchemy
  Commit: b8e57752e9a4df98616ab2ea0bd719642b678f3e
      https://github.com/zopefoundation/zope.sqlalchemy/commit/b8e57752e9a4df98616ab2ea0bd719642b678f3e
  Author: Esa Varemo <esa at kuivanto.fi>
  Date:   2020-10-05 (Mon, 05 Oct 2020)

  Changed paths:
    M src/zope/sqlalchemy/README.rst

  Log Message:
  -----------
  Fix external links in README

pyramid_tm docs no longer have a dev-version and repoze.tm2 seems to have moved (original site unavailable).
Also prefer HTTPS where available