added additional whatsnew entry

Author: bjlittle

docs/src/whatsnew/latest.rst

@@ -129,7 +129,6 @@ This document explains the changes made to Iris for this release
    they render better in the published documentation.  See :issue:`4085`.
    (:pull:`4100`)
 
-
 💼 Internal
 ===========
 
@@ -185,6 +184,9 @@ This document explains the changes made to Iris for this release
 #. `@bjlittle`_ renamed ``iris/master`` branch to ``iris/main`` and migrated
    references of ``master`` to ``main`` within codebase. (:pull:`4202`)
 
+#. `@bjlittle`_ consolidated `nox`_ ``black``, ``flake8`` and ``isort`` sessions
+   into one ``lint`` session using ``pre-commit``. (:pull:`4181`)
+
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,
     core dev names are automatically included by the common_links.inc: