Update README.md (#190)

postgis_raster got broken out as a separate extension in PostGIS 3.0, so should be noted in the readme

Author: robe2

README.md

@@ -8,9 +8,10 @@ This image ensures that the default database created by the parent `postgres` im
 
 * `postgis`
 * `postgis_topology`
-* `fuzzystrmatch`
 * `postgis_tiger_geocoder`
 
+Note: As of PostGIS v3.x, raster has been factored out into a separate extension `postgis_raster` which must be installed separately.
+
 Unless `-e POSTGRES_DB` is passed to the container at startup time, this database will be named after the admin user (either `postgres` or the user specified with `-e POSTGRES_USER`). If you would prefer to use the older template database mechanism for enabling PostGIS, the image also provides a PostGIS-enabled template database called `template_postgis`.
 
 ## Usage