Mention six digit iin and two digit last digit support in HISTORY

Author: ugexe

HISTORY.rst

@@ -23,6 +23,15 @@ History
   * ``payvision``
   * ``trustly``
   * ``windcave``
+* The ``/credit_card/last_4_digits`` input has been deprecated in favor of
+  ``/credit_card/last_digits`` and will be removed in a future release.
+  ``last_digits``/``last_4_digits`` also now supports two digit values in
+  addition to the previous four digit values.
+* Eight digit ``/credit_card/issuer_id_number`` inputs are now supported in
+  addition to the previously accepted six digit ``issuer_id_number``. If you
+  send six digits for the ``issuer_id_number``, you should send the last four
+  digits for ``last_digits``. If you send eight digits for ``issuer_id_number``
+  you should send the last two digits for ``last_digits``.
 
 2.5.0 (2021-09-20)
 ++++++++++++++++++