Correct default port in postgresql example config

config_example.py

@@ -23,7 +23,7 @@ mysql_config = {
 # PostgreSQL connection values.
 postgresql_config = {
     'host': '127.0.0.1',
-    'port': '3306',
+    'port': '5432',
     'name': 'db_name',
     'user': 'db_user',
     'password': 'db_pass',