Update README.md

Author: okbob

README.md

@@ -33,7 +33,7 @@ google group.
 
 I invite any ideas, patches, bugreports.
 
-PostgreSQL PostgreSQL 12 - 16 are supported.
+PostgreSQL PostgreSQL 12 - 17 are supported.
 
 The SQL statements inside PL/pgSQL functions are checked by the validator for semantic errors. These errors
 can be found by calling the plpgsql_check_function: