chore(docs): update release notes ahead of 2.18.4

jhamman · jhamman · commit 207e1a09287d · 2024-09-04T16:27:56.000-07:00
diff --git a/docs/release.rst b/docs/release.rst
@@ -18,6 +18,19 @@ Release notes
    See `GH1777 <https://github.com/zarr-developers/zarr-python/issues/1777>`_ for more details on the upcoming
    3.0 release.
 
+.. _release_2.18.4:
+
+2.18.4 (unreleased)
+-------------------
+
+Enhancements
+~~~~~~~~~~~~
+
+Maintenance
+~~~~~~~~~~~
+
+Deprecations
+~~~~~~~~~~~~
 
 .. _release_2.18.3:
 
