Use 1-thread pool

Author: alejandro-du

reactive-programming/src/main/java/com/example/Application.java

@@ -6,7 +6,7 @@
 public class Application {
 
     public static void main(String[] args) {
-        ExecutorService threadPool = Executors.newFixedThreadPool(2);
+        ExecutorService threadPool = Executors.newFixedThreadPool(1);
 
         for (int u = 1; u <= 10; u++) {
             var user = "User " + u;