Update README.md

Author: richturner

README.md

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 # Postgresql docker image
 [![build multirach postgresql Docker image and push to it dockerhub](https://github.com/openremote/postgresql/actions/workflows/postgresql.yml/badge.svg)](https://github.com/openremote/postgresql/actions/workflows/postgresql.yml)
 
-PostgreSQL docker image with openremote env variables and post GIS extension (PostGIS docker image is only built for linux/amd64 but when this changes then this image is obsolete).
+PostgreSQL docker image based on [Timescale's](https://www.timescale.com/) [timescaledev/timescaledb-ha](https://hub.docker.com/r/timescaledev/timescaledb-ha) docker image which contains post GIS and timescaleDB extensions.