The django.db.backends.postgresql_psycopg2 module is deprecated in favor of django.db.backends.postgresql. It’s been an alias since Django 1.9

.travis/postgresql_settings.py

@@ -40,7 +40,7 @@ SERVERNAME = "testing_mygame"
 
 DATABASES = {
     "default": {
-        "ENGINE": "django.db.backends.postgresql_psycopg2",
+        "ENGINE": "django.db.backends.postgresql",
         "NAME": "evennia",
         "USER": "evennia",
         "PASSWORD": "password",