Add changelog

Author: Archmonger

CHANGELOG.md

@@ -23,6 +23,8 @@ Don't forget to remove deprecated code on each major release!
 
 -   Set maximum ReactPy version to `<2.0.0`.
 -   Set minimum ReactPy version to `1.1.0`.
+-   `link` element now calculates URL changes using the client.
+-   Refactoring related to `reactpy>=1.1.0` changes.
 
 ### Fixed