[Checkins] [zopefoundation/zope.sqlalchemy] b80254: Add documentation, fix tests.

[Michael Howitz]

  Branch: refs/heads/icemac-patch-1
  Home:   https://github.com/zopefoundation/zope.sqlalchemy
  Commit: b80254318d4cbd7f14d0200c5dcc4a0c38d00106
      https://github.com/zopefoundation/zope.sqlalchemy/commit/b80254318d4cbd7f14d0200c5dcc4a0c38d00106
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-02-17 (Mon, 17 Feb 2020)

  Changed paths:
    M CHANGES.rst
    M src/zope/sqlalchemy/README.rst
    M src/zope/sqlalchemy/datamanager.py

  Log Message:
  -----------
  Add documentation, fix tests.