Changed storage for existing installations [skip ci]

CHANGELOG.md

@@ -1,7 +1,7 @@
 ## 0.4.0 (unreleased)
 
 - Changed text representation for vector elements to match `real`
-- Changed storage for vector from `plain` to `extended` for new installations
+- Changed storage for vector from `plain` to `extended`
 - Improved accuracy of text parsing for certain inputs
 - Added `avg` aggregate for vector
 - Added experimental support for Windows

sql/vector--0.3.2--0.4.0.sql

@@ -1,8 +1,8 @@
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "ALTER EXTENSION vector UPDATE TO '0.4.0'" to load this file. \quit
 
--- requires Postgres 13+
--- ALTER TYPE vector SET (STORAGE = extended);
+-- comment out this single line for Postgres < 13
+ALTER TYPE vector SET (STORAGE = extended);
 
 CREATE FUNCTION vector_accum(double precision[], vector) RETURNS double precision[]
 	AS 'MODULE_PATHNAME' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;