update Changelog

Author: devhawk

CHANGELOG.md

@@ -10,6 +10,8 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 
 - The invoke file editor now supports editing invocation files that use arrays or objects as contract parameters
 - Extension logs are now also shown in the VS Code Output Panel
+- Fixed an issue that blocked deployment of contracts to Neo N3 TestNet
+- Removed "Invoke Contract" menu item for non Express blockchain networks as feature is not complete
 
 ## [2.1.49] - 2021-06-21