message: updating TS generator version using the mentioned convention
diff: @@ -123,7 +123,7 @@ try-require: ./readme.typescript.md
  ``` yaml $(typescript)
  use-extension:
  - "@microsoft.azure/autorest.typescript": "^4.1.1"
  + "@microsoft.azure/autorest.typescript": "~4.2.0"
  try-require: ./readme.typescript.md
  ```
  