docs: add changelog

Author: kenjis

user_guide_src/source/changelogs/v4.4.2.rst

@@ -34,6 +34,8 @@ Deprecations
   details.
 - **CLI:** The public property ``CLI::$readline_support`` and ``CLI::$wait_msg``
   are deprecated. These methods will be protected.
+- **CodeIgniter:** The parameter ``$config`` for the ``displayCache()`` method is
+  deprecated. It was not used.
 
 Bugs Fixed
 **********