message: Update ChangeAnalysis latest tag to package-2021-04-01
diff: @@ -26,7 +26,7 @@ These are the global settings for the changeanalysis.
  ``` yaml
  openapi-type: arm
  -tag: package-2020-04-01-preview
  +tag: package-2021-04-01
  ```
  ### Tag: package-2020-04-01-preview
  