renamed column created_at

aharlamcev/postgresql/homeworkDDL.sql

@@ -29,4 +29,7 @@ quantity int not null,
 price_at_purchase DECIMAL(10, 2) not null,
 foreign key (order_id) references orders(id),
 foreign key (product_id) references products(id)
-) ;
+) ;
+
+alter table users
+rename column crated_at to created_at;