Updated PostgreSQL database backend engine

The PostgreSQL backend (django.db.backends.postgresql_psycopg2) is also available as django.db.backends.postgresql since version 1.9, has been deprecated in version 2.0 and has been removed in version 3.0

Author: pauloxnet

DjangoPlugin/tracdjangoplugin/settings.py

@@ -11,7 +11,7 @@
 
 DATABASES = {
     "default": {
-        "ENGINE": "django.db.backends.postgresql_psycopg2",
+        "ENGINE": "django.db.backends.postgresql",
         "NAME": "djangoproject",
         "USER": "djangoproject",
         "HOST": SECRETS.get("db_host", ""),