fix an output in examples/postgres/Readme.md

examples/postgres/Readme.md

@@ -8,6 +8,7 @@ cargo run
 Example output:
 ```
 DROP TABLE IF EXISTS "document"; CREATE TABLE IF NOT EXISTS "document" ( "id" serial NOT NULL PRIMARY KEY, "uuid" uuid, "json_field" jsonb, "timestamp" timestamp, "timestamp_with_time_zone" timestamp with time zone, "decimal" decimal, "array" integer[] ); CREATE INDEX "partial_index_small_decimal" ON "document" ("decimal") WHERE NOT "decimal" < 11
+Create table document: Ok(())
 
 Insert into document: Ok(1)