Add deprecation notice

Author: jbeemster

README.md

@@ -6,6 +6,12 @@ A Terraform module which deploys a Snowplow Postgres Loader application on AWS r
 
 _WARNING_: If you are upgrading from module version 0.1.x you will need to issue a manual table update - [details can be found here](https://discourse.snowplowanalytics.com/t/snowplow-postgres-loader-0-3-0-released/5553#changing-some-of-the-column-types-7).  You will need to adjust the alter table command with the schema that your `events` table is deployed within.
 
+## Deprecation notice
+
+**This module is now deprecated.**
+
+We will no longer be updating this module - for supported destinations see the [guide here](https://docs.snowplow.io/docs/getting-started-on-snowplow-open-source/quick-start-aws).
+
 ## Telemetry
 
 This module by default collects and forwards telemetry information to Snowplow to understand how our applications are being used.  No identifying information about your sub-account or account fingerprints are ever forwarded to us - it is very simple information about what modules and applications are deployed and active.