Update README.md about docker images (#960)

Author: dpxcc

README.md

@@ -161,13 +161,13 @@ GROUP BY date;
 Run PostgreSQL with pg_duckdb pre-installed in a docker container:
 
 ```bash
-docker run -d -e POSTGRES_PASSWORD=duckdb pgduckdb/pgduckdb:18-v1.0.0
+docker run -d -e POSTGRES_PASSWORD=duckdb pgduckdb/pgduckdb:17-v1.0.0
 ```
 
 With MotherDuck:
 ```bash
 export MOTHERDUCK_TOKEN=<your_token>
-docker run -d -e POSTGRES_PASSWORD=duckdb -e MOTHERDUCK_TOKEN pgduckdb/pgduckdb:18-v1.0.0
+docker run -d -e POSTGRES_PASSWORD=duckdb -e MOTHERDUCK_TOKEN pgduckdb/pgduckdb:17-v1.0.0
 ```
 
 ### Try with Hydra

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   db:
-    image: pgduckdb/pgduckdb:16-main
+    image: pgduckdb/pgduckdb:18-main
     ports:
       - ${PORT:-5432}:5432
     environment:

docker/README.md

@@ -4,10 +4,9 @@
 
 Any tagged release are built and pushed with the tag `$POSTGRES_VERSION-$TAG`, for example:
 
-* `15-v0.1.0`
-* `16-v0.1.0`
-* `17-v0.1.0`
-* `18-v0.1.0`
+* `15-v1.0.0`
+* `16-v1.0.0`
+* `17-v1.0.0`
 
 ### Nightly builds
 
@@ -23,21 +22,21 @@ A corresponding tag with the git sha of the build is also pushed.
 If you use a nightly image tag, you will need to pull to receive updates, for example:
 
 ```
-docker pull pgduckdb/pgduckdb:16-main
+docker pull pgduckdb/pgduckdb:18-main
 ```
 
 ## Usage instructions
 
 Use of this image is [the same as the Postgres image](https://hub.docker.com/_/postgres/). For example, you can run the image directly:
 
 ```shell
-docker run -d -e POSTGRES_PASSWORD=duckdb pgduckdb/pgduckdb:16-main
+docker run -d -e POSTGRES_PASSWORD=duckdb pgduckdb/pgduckdb:18-main
 ```
 
 And with MotherDuck, it is as simple as:
 ```shell
 $ export MOTHERDUCK_TOKEN=<your personal MD token>
-$ docker run -d -e POSTGRES_PASSWORD=duckdb -e MOTHERDUCK_TOKEN pgduckdb/pgduckdb:16-main
+$ docker run -d -e POSTGRES_PASSWORD=duckdb -e MOTHERDUCK_TOKEN pgduckdb/pgduckdb:18-main
 ```
 
 You can also use docker compose from duckdb/pg_duckdb: