[Checkins] [zopefoundation/zope.schema] c80a20: Improve change log for #86 and bump version.

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.schema
  Commit: c80a2035b636a591993d038d3c992ef6e26a20d4
      https://github.com/zopefoundation/zope.schema/commit/c80a2035b636a591993d038d3c992ef6e26a20d4
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-02-28 (Fri, 28 Feb 2020)

  Changed paths:
    M CHANGES.rst
    M version.txt

  Log Message:
  -----------
  Improve change log for #86 and bump version.

The change is not backwards compatible.