[zope] Zope 5.5.2 released

On behalf of Zope developer community I am pleased to announce the release of Zope 5.5.2. This bugfix release cleans up several smaller issues and will be the base for the first Plone 6 beta release. For the full list of changes see the change log at https://zope.readthedocs.io/en/latest/changes.html#id1. Installation instructions can be found at https://zope.readthedocs.io/en/latest/INSTALL.html. Jens Vagelpohl