Replaced depricated code to establish a connection

hello_client/main.go

@@ -18,7 +18,7 @@ const (
 
 func main() {
 	// Set up a connection to the server.
-	//conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock())
+	//Depricated: conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock())
 	conn, err := grpc.NewClient(address, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
 		log.Fatalf("did not connect: %v", err)