fix incorrect port forward pod port

README.md

@@ -38,7 +38,7 @@ In order to run the app against the RDS database, you will need to do the follow
     --image=ministryofjustice/port-forward \
     --port=5432 \
     --env="REMOTE_HOST=cloud-platform-2d5acdf1ab5379e3.cdwm328dlye6.eu-west-2.rds.amazonaws.com" \
-    --env="LOCAL_PORT=1234" \
+    --env="LOCAL_PORT=5432" \
     --env="REMOTE_PORT=5432"
     ```
 2) Forward traffic from your local host to the remote pod and keep the connection open. Note the local port.