fix: ratelimit-callee-service UnknownHostException: RateLimitCalleeService in 2020 (#291)

* fix:fix UnknownHostException

* fix:fix UnknownHostException

* update changelog.md

CHANGELOG.md

@@ -9,3 +9,4 @@
 - [change the way from escape to encode in 2020.0](https://github.com/Tencent/spring-cloud-tencent/pull/257)
 - [fix:fix ClassNotFoundException while not importing openfeign when using circuit-breaker module.](https://github.com/Tencent/spring-cloud-tencent/pull/270)
 - [fix:solve the chaos code problem on rejectTips](https://github.com/Tencent/spring-cloud-tencent/pull/283)
+- [fix:solve ratelimit-callee-service UnknownHostException.](https://github.com/Tencent/spring-cloud-tencent/pull/291)

spring-cloud-tencent-examples/polaris-ratelimit-example/ratelimit-callee-service/pom.xml

@@ -18,6 +18,11 @@
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
 
+        <dependency>
+            <groupId>com.tencent.cloud</groupId>
+            <artifactId>spring-cloud-starter-tencent-polaris-discovery</artifactId>
+        </dependency>
+
 		<dependency>
 			<groupId>com.tencent.cloud</groupId>
 			<artifactId>spring-cloud-starter-tencent-polaris-ratelimit</artifactId>