Log Message:
py-django2: updated to 2.0.4

Django 2.0.4:
Bugfixes:
Fixed a crash when filtering with an Exists() annotation of a queryset \ 
containing a single field.
Fixed admin autocomplete widget’s translations for zh-hans and zh-hant languages.
Corrected admin’s autocomplete widget to add a space after custom classes.
Fixed PasswordResetConfirmView crash when using a user model with a UUIDField \ 
primary key and the reset URL contains an encoded primary key value that decodes \ 
to an invalid UUID.
Fixed a regression in Django 1.11.8 where combining two annotated values_list() \ 
querysets with union(), difference(), or intersection() crashed due to \ 
mismatching columns.
Fixed a regression in Django 1.11 where an empty choice could be initially \ 
selected for the SelectMultiple and CheckboxSelectMultiple widgets.
Fixed a regression in Django 2.0 where OpenLayersWidget deserialization ignored \ 
the widget map’s SRID and assumed 4326