remove -u for go get in sync-dtmcli

helper/sync-dtmcli.sh

@@ -37,7 +37,7 @@ git push --tags
 cd ../dtmgrpc
 rm -rf *.go dtmgimp
 cp -r ../dtm/dtmgrpc/* ./
-go get -u github.com/yedf/dtmcli@$ver
+go get github.com/yedf/dtmcli@$ver
 sed -i '' -e 's/yedf\/dtm\//yedf\//g' *.go
 sed -i '' -e 's/yedf\/dtm\//yedf\//g' dtmgimp/*.go dtmgimp/*.proto
 rm -rf *_test.go
@@ -50,8 +50,8 @@ git tag $ver
 git push --tags
 
 cd ../dtmgrpc-go-sample
-go get -u github.com/yedf/dtmcli@$ver
-go get -u github.com/yedf/dtmgrpc@$ver
+go get github.com/yedf/dtmcli@$ver
+go get github.com/yedf/dtmgrpc@$ver
 protoc --go_out=. --go_opt=paths=source_relative --go-grpc_out=. --go-grpc_opt=paths=source_relative busi/*.proto || exit 1
 go build || exit 1
 git add .