cached_property missing dependency from edocument_uncefact
cached_property is in the test dependencies but not ine the regular ones.
Intializing the module with trytond leads to this trace :
trytond_edocument_uncefact-4.8.0-py3.5.egg/trytond/modules/edocument_uncefact/edocument.py", line 8, in
from cached_property import cached_property
ImportError: No module named 'cached_property'