message: add alertsmanagement package-preview-2019-05 to Go SDK
diff: @@ -12,9 +12,19 @@ go:
  ### Go multi-api
  ``` yaml $(go) && $(multiapi)
  batch:
  + - tag: package-preview-2019-05
  - tag: package-2018-05
  ```
  +### Tag: package-preview-2019-05 and go
  +
  +These settings apply only when `--tag=package-preview-2019-05 --go` is specified on the command line.
  +Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
  +
  +``` yaml $(tag) == 'package-preview-2019-05' && $(go)
  +output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2019-05-05/$(namespace)
  +```
  +
  ### Tag: package-2018-05 and go
  These settings apply only when `--tag=package-2018-05 --go` is specified on the command line.
  