Merge pull request #646 from bashtage/rls-5.5

RLS: Rlease note for 5.5

Author: bashtage

doc/source/changes/5.0.txt

@@ -2,6 +2,13 @@
 Version 5
 =========
 
+Release 5.5
+===========
+- NumPy 1.25 fixes
+- Initial pandas copy-on-write support
+- Switched doc theme to sphinx-immaterial
+- Small fixes for typing issues
+
 Release 5.4
 ===========
 - Compatability release with pandas 2.0