We need to pin plone.formwidget.recurrence to at least 1.2.3 to be compliant with plone.app.event 2.0a4.dev0 requirements (plone.formwidget.recurrence[z3cform]>=1.2.3)
Merge pull request #17 from plone/fix-versions

Pin plone.formwidget.recurrence = 1.2.3