update CHANGELOG (about DispatchChecker)

CHANGELOG.md

@@ -17,6 +17,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add example Pluto notebook which plots clock skew histogram
 - Add `count_riseup` to count rise up in clock result
 - Add example app using Pluto
+- Add `DispatchChecker` module
+- Add `is_dispatchable` which checks given PSBoard is ready to dispatch
+- Add `interactive_dispatch_checker` which provide interactive session for QAQC
 
 ### Changed