Update README.md

Author: wdwqw

README.md

@@ -119,7 +119,7 @@ shared_ptr<ConsoleLogSystem> log(cls);
 InitializeLogging(log);
 
 // 创建HttpRequest对象
-HttpRequest request(URI("YOUR URL"), HttpMethod::HTTP_GET);
+HttpRequest request(URI("http://www.jdcloud-api.com/v1/regions/cn-north-1/instances?pageNumber=2&pageSize=10"), HttpMethod::HTTP_GET);
 request.SetHeaderValue(CONTENT_TYPE_HEADER, "application/json");
 request.SetHeaderValue(USER_AGENT_HEADER, "JdcloudSdkCpp/1.0.2 vm/0.7.4");