message: fix in readme file for latest sdk generation
diff: @@ -28,7 +28,7 @@ These are the global settings for the RecoveryServicesBackup API.
  title: Recovery Services Backup Client
  description: Open API 2.0 Specs for Azure RecoveryServices Backup service
  openapi-type: arm
  -tag: package-2021-01
  +tag: package-2021-04
  csharp-sdks-folder: ./Generated/CSharp
  python-sdks-folder: ./Generated/Python
  go-sdk-folder: ./Generated/Golang
  