Updated changelog

CHANGELOG.md

@@ -5,6 +5,12 @@ The changelog format is based on [Keep a Changelog](https://keepachangelog.com/e
 
 ## [Unreleased]
 
+### Changed
+* Default agent_(input/output)_indexes is [] by default instead of None
+* Updated doc by running publish-interface-docs
+* Added feature to be able to initialize states using previously defined parameters or inputs
+  * This is done by setting "initializationVariable" = "{variable name}", instead of using the "name" and "start_value" attributes
+
 ### Changed
 * OnnxFmu cpp template class updated to be able to initialize state with FMU Variables
   * Add variables to specify which FMU variable that should be used to initialize which state