The previous example syntax did not work for me

Adding another example that did work.

examples/postgres.md

@@ -1,4 +1,4 @@
-# Example: Postgres
+# Example 1: Postgres
 With thanks to [@roflmao](https://github.com/roflmao)
 ```
 input
@@ -13,3 +13,23 @@ output {
 }
 ```
 
+# Example 2: If the previous example doesn't work (i.e. connection errors)
+
+> Tested with https://jdbc.postgresql.org/download/postgresql-42.1.4.jre7.jar saved to /opt/logstash/vendor/jar/jdbc/
+> Not sure if the `connection_test => false` is necessary or not.
+
+```
+input
+{
+	stdin { }
+}
+output {
+	jdbc {
+		connection_string => 'jdbc:postgresql://hostname:5432/database'
+		connection_test => false
+		username => 'username'
+		password => 'password'
+		statement => [ "INSERT INTO log (host, timestamp, message) VALUES(?, CAST (? AS timestamp), ?)", "host", "@timestamp", "message" ]
+	}
+}
+```