touch updated_at when saving the imported_row_count (#3752)
touch updated_at when saving the imported_row_count (#3752)

* touch updated_at when saving the imported_row_count

ensure we cache bust the serializer to report the import progress

* fix whitespace
zooniverse/Panoptes,zooniverse/Panoptes,zooniverse/Panoptes,zooniverse/Panoptes