syntax: rename package to djangoldp_notification (singular)

djangoldp_notification/__init__.py

+name = "djangoldp_notification"

djangoldp_notification/apps.py

+from django.apps import AppConfig
+
+class DjangoldpNotificationConfig(AppConfig):
+    name = 'djangoldp_notification'

djangoldp_notifications/__init__.py

-name = "djangoldp_notifications"
\ No newline at end of file

djangoldp_notifications/apps.py

-from django.apps import AppConfig
-
-class DjangoldpNotificationsConfig(AppConfig):
-    name = 'djangoldp_notifications'