[zope] Zope 4.8.4 and 5.7.1 released with a security fix

On behalf of Zope developer community I am pleased to announce the releases of Zope 4.8.4 and 5.7.1. This release fixes a security issue related to the "Content-Type" response header and how its default is set during publishing. For the full list of changes see the change logs at https://zope.readthedocs.io/en/4.x/changes.html#id1 and https://zope.readthedocs.io/en/latest/changes.html#id1 Installation instructions can be found at https://zope.readthedocs.io/en/4.x/INSTALL.html and https://zope.readthedocs.io/en/latest/INSTALL.html. Jens Vagelpohl