docs: add changelog

Author: kenjis

user_guide_src/source/changelogs/v4.6.0.rst

@@ -97,6 +97,9 @@ Method Signature Changes
   changed. The ``RouteCollection`` typehint has been changed to ``RouteCollectionInterface``.
 - **View:** The return type of the ``renderSection()`` method has been
   changed to ``string``, and now the method does not call ``echo``.
+- **Time:** The first parameter type of the ``createFromTimestamp()`` has been
+  changed from ``int`` to ``int|float``, and the return type ``static``` has been
+  added.
 
 Removed Type Definitions
 ------------------------