Add Renaming A Sequence as a postgres til

postgres/renaming-a-sequence.md

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+# Renaming A Sequence
+
+If a table is created with a `serial` type column, then a sequence is also
+created with a name based on the name of the table.
+
+```sql
+> \d
+            List of relations
+ Schema |       Name      |   Type   |   Owner
+--------+-----------------+----------+------------
+ public | accounts        | table    | jbranchaud
+ public | accounts_id_seq | sequence | jbranchaud
+```
+
+In [Renaming A Table](renaming-a-table.md), I showed how a table can be
+renamed in PostgreSQL. This will not, however, rename associated sequences.
+To maintain naming consistency, you may want to also rename sequences when
+renaming tables. This can be done with a query like the following:
+
+```sql
+> alter sequence accounts_id_seq rename to users_id_seq;
+```
+
+See the [`alter
+sequence`](http://www.postgresql.org/docs/current/static/sql-altersequence.html)
+docs for more details.