Merge pull request #567 from xelatirdan/patch-1

Add error prone SQL in README.md

Author: sysadmind

Diff for: README.md

@@ -277,6 +277,7 @@ AS
 
 GRANT SELECT ON postgres_exporter.pg_stat_replication TO postgres_exporter;
 
+CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
 CREATE OR REPLACE FUNCTION get_pg_stat_statements() RETURNS SETOF pg_stat_statements AS
 $$ SELECT * FROM public.pg_stat_statements; $$
 LANGUAGE sql