message: Add missing config for Go.
diff: @@ -148,6 +148,7 @@ go:
  batch:
  - tag: package-2017-04
  - tag: package-2015-08
  + - tag: package-2018-01-preview
  ```
  ### Tag: package-2017-04 and go
  @@ -159,6 +160,15 @@ Please also specify `--go-sdk-folder=<path to the root directory of your azure-s
  output-folder: $(go-sdk-folder)/services/eventhub/mgmt/2017-04-01/eventhub
  ```
  +### Tag: package-2018-01-preview and go
  +
  +These settings apply only when `--tag=package-2018-01-preview --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-2018-01-preview' && $(go)
  +output-folder: $(go-sdk-folder)/services/preview/eventhub/mgmt/2018-01-01-preview/eventhub
  +```
  +
  ### Tag: package-2015-08 and go
  These settings apply only when `--tag=package-2015-08 --go` is specified on the command line.
  