I think I found another issue related with plone.app.event 1.1.8:
ZopeXMLConfigurationError: File "/home/travis/build/collective/collective.cover/eggs/plone.app.event-1.1.8-py2.7.egg/plone/app/event/at/configure.zcml", line 11.4-11.35
ZopeXMLConfigurationError: File "/home/travis/build/collective/collective.cover/eggs/plone.app.event-1.1.8-py2.7.egg/plone/app/event/at/upgrades/configure.zcml", line 11.4-15.8
ImportError: No module named contentmigration.archetypes
full traceback: https://travis-ci.org/collective/collective.cover/jobs/211982738#L4293