message: add authorization 2018-07-01 to Go SDK
diff: @@ -16,6 +16,7 @@ batch:
  - tag: package-2015-07-01
  - tag: package-2017-10-01-preview
  - tag: package-2018-01-01-preview
  + - tag: package-2018-07-01-preview
  - tag: package-2018-09-01-preview
  ```
  @@ -46,6 +47,15 @@ Please also specify `--go-sdk-folder=<path to the root directory of your azure-s
  output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2018-01-01-preview/$(namespace)
  ```
  +### Tag: package-2018-07-01-preview and go
  +
  +These settings apply only when `--tag=package-2018-07-01-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-2018-07-01-preview' && $(go)
  +output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2018-07-01-preview/$(namespace)
  +```
  +
  ### Tag: package-2018-09-01-preview and go
  These settings apply only when `--tag=package-2018-09-01-preview --go` is specified on the command line.
  