add script to automate gopogh version update

go.mod

@@ -4,7 +4,6 @@ go 1.15
 
 require (
 	cloud.google.com/go/storage v1.10.0
-	contrib.go.opencensus.io/exporter/stackdriver v0.12.1
 	github.com/Azure/azure-sdk-for-go v42.3.0+incompatible
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace v0.13.0
 	github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5 // indirect
@@ -76,7 +75,6 @@ require (
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v0.0.0-20180618132009-1d523034197f
 	github.com/zchee/go-vmnet v0.0.0-20161021174912-97ebf9174097
-	go.opencensus.io v0.22.4
 	go.opentelemetry.io/otel v0.13.0
 	go.opentelemetry.io/otel/sdk v0.13.0
 	golang.org/x/build v0.0.0-20190927031335-2835ba2e683f