Add PostgresQL transport to list of community transports (#1697)

* Update transports.md

* fix link syntax

* use @pauleliet/winston-pg-native which is more up to date

* remove duplicate info from README

docs/transports.md

@@ -49,6 +49,7 @@ there are additional transports written by
   * [Mail](#mail-transport)
   * [Newrelic](#newrelic-transport) (errors only)
   * [Papertrail](#papertrail-transport)
+  * [PostgresQL](#postgresql-transport)
   * [Pusher](#pusher-transport)
   * [Sentry](#sentry-transport)
   * [SimpleDB](#simpledb-transport)
@@ -651,6 +652,10 @@ The Papertrail transport connects to a [PapertrailApp log destination](https://p
 
 *Metadata:* Logged as a native JSON object to the 'meta' attribute of the item.
 
+### PostgresQL Transport
+
+[@pauleliet/winston-pg-native](https://github.com/petpano/winston-pg-native) is a PostgresQL transport supporting Winston 3.X.
+
 ### Pusher Transport
 [winston-pusher](https://github.com/meletisf/winston-pusher) is a Pusher transport.