Update HelloWorldController.java

src/main/java/io/kubesphere/devops/HelloWorldController.java

@@ -14,6 +14,6 @@ public class HelloWorldController {
 
     @RequestMapping("/")
     public String sayHello() {
-        return "Really appreaciate your star, that's the power of our life.";
+        return "Really appreaciate your star, that's the power of our life!";
     }
 }