Revert "Primary keys that are most likely natural keys"

This reverts commit d274569.

Author: mfvanek

README.md

@@ -53,7 +53,6 @@ For more information please see [PostgreSQL Versioning Policy](https://www.postg
 29. Primary keys with varchar columns instead of uuids ([sql](https://github.com/mfvanek/pg-index-health-sql/blob/master/sql/primary_keys_with_varchar.sql)).
 30. Columns with [varchar(n)](https://www.postgresql.org/docs/current/datatype-character.html) type ([sql](https://github.com/mfvanek/pg-index-health-sql/blob/master/sql/columns_with_fixed_length_varchar.sql)).
 31. Indexes with unnecessary where-clause on not null column ([sql](https://github.com/mfvanek/pg-index-health-sql/blob/master/sql/indexes_with_unnecessary_where_clause.sql)).
-32. Primary keys that are most likely natural keys ([sql](https://github.com/mfvanek/pg-index-health-sql/blob/master/sql/primary_keys_that_most_likely_natural_keys.sql)).
 
 ## Local development