Report how many changes were done in the interface

plans/README.md

@@ -28,9 +28,9 @@ plans small:
    transaction-local counters, streaming (06) needs a transaction to keep a server-side
    cursor open, and `PROFILE` (01) needs a savepoint. All three want `Session.run` to
    wrap auto-commit queries in `BEGIN ... COMMIT` instead of relying on the
-   connection's autocommit mode. Plan 06 only did this for read queries, which run
-   in a cursor's transaction; queries that can write still use autocommit, so 02 still
-   has to add it for them.
+   connection's autocommit mode. This is done: reads run in a cursor's transaction
+   (06), and queries that can write in one around the statistics (02). `Session._script`
+   runs such a transaction in one round trip.
 3. **Unit tests.** The only test is the end-to-end `tests/smoke_test.py`. Most of
    this work is text rewriting in `cypher.py`, which is cheap to unit test without a
    database. Add `tests/test_cypher.py` (pytest) alongside the first plan that