Add changelog

Author: Archmonger

docs/source/about/changelog.rst

@@ -21,6 +21,7 @@ Unreleased
 - :pull:`1239` - Script elements no longer support behaving like effects. They now strictly behave like plain HTML script elements.
 - :pull:`1255` - The ``reactpy.html`` module has been modified to allow for auto-creation of any HTML nodes. For example, you can create a ``<data-table>`` element by calling ``html.data_table()``.
 - :pull:`1256` - Change ``set_state`` comparison method to check equality with ``==`` more consistently.
+- :pull:`1257` - Add support for rendering ``@component`` children within ``vdom_to_html``.
 
 **Removed**