Update Changelog.md

docs/changelog.md

@@ -1,5 +1,8 @@
 # Changelog - Patch Notes
 
+## Version 2.0
+Implement new serial API with new module expansion protocol.
+
 ## Version 1.0.0
 The initial version of the application encompasses functionalities to inserting a GAME BOY Camera cartridge, you can use it as a camera and take snapshots from the Flipper Zero.