update changelog to reflect branch merge

CHANGELOG.md

@@ -7,18 +7,16 @@ The releases of major and minor versions contain an overview of changes since th
 Branch Changes
 --------------
 
-- n-ary predicates like atMostOneOf, ExactlyOneOf added
-- export to Dice expressions added
-- prism language simulator
-- masks
-- export state lookup map
-
 Version 1.6.x
 -------------
 ## Version 1.6.4 (20xx/xx)
 - Added an export of check results to json. Use `--exportresult` in the command line interface.
 - Added computation of steady state probabilities for DTMC/CTMC in the sparse engine. Use `--steadystate` in the command line interface.
 - Implemented parsing and model building of Stochastic multiplayer games (SMGs) in the PRISM language. No model checking implemented, for now.
+- API: Simulation of prism-models 
+- API: Model-builder takes a callback function to prevent extension of particular actions, prism-to-explicit mapping can be exported
+- API: Export of dice-formatted expressions
+- Prism-language: n-ary predicates are supported (e.g., ExactlyOneOf)
 - Added support for continuous integration with Github Actions.
 - `storm-pars`: Exploit monotonicity for computing extremal values and parameter space partitioning.