PEP 387: Update changelog to mention 5-year deprecation period (GH-4279)

Author: brettcannon

peps/pep-0387.rst

@@ -199,6 +199,7 @@ several releases:
 Changelog
 =========
 
+* 2025-Jan-27: Updated to prefer a 5-year deprecation period before removal.
 * 2023-Nov-14: Added ``@deprecated`` decorator per :pep:`702`.
 * 2023-Jul-03: Added the Soft Deprecation section, as discussed in
   `<https://discuss.python.org/t/27957>`__.