Make use of new GetMapping and PostMapping annotations

Closes gh-5277

spring-boot-samples/spring-boot-sample-web-velocity/src/main/java/sample/web/velocity/WelcomeController.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,7 +21,7 @@ import java.util.Map;
 
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.GetMapping;
 
 @Controller
 public class WelcomeController {
@@ -29,7 +29,7 @@ public class WelcomeController {
 	@Value("${application.message:Hello World}")
 	private String message = "Hello World";
 
-	@RequestMapping("/")
+	@GetMapping("/")
 	public String welcome(Map<String, Object> model) {
 		model.put("time", new Date());
 		model.put("message", this.message);