Add new api-version 2020-06-30 of compute to go SDK

Author: ArcturusZhang

specification/compute/resource-manager/readme.go.md

@@ -31,6 +31,7 @@ directive:
 
 ```yaml $(go) && $(multiapi)
 batch:
+  - tag: package-2020-06-30
   - tag: package-2020-06-01
   - tag: package-2019-12-01
   - tag: package-2019-07
@@ -50,6 +51,16 @@ batch:
   - tag: package-container-service-2015-11-preview
 ```
 
+### Tag: package-2020-06-30 and go
+
+These settings apply only when `--tag=package-2020-06-30 --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-2020-06-30' && $(go)
+namespace: compute
+output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2020-06-30/$(namespace)
+```
+
 ### Tag: package-2020-06-01 and go
 
 These settings apply only when `--tag=package-2020-06-01 --go` is specified on the command line.