fix readme

README.md

@@ -140,3 +140,4 @@ Please make sure to read the [Contributing Guide](CONTRIBUTING.md) before making
 [latest-release]: https://github.com/aliyun/alibaba-cloud-sdk-go/releases
 [go]: https://golang.org/dl/
 [endpoints]: https://developer.aliyun.com/endpoints
+[Requirements]: docs/0-Requirements-EN.md

README_zh.md

@@ -137,3 +137,4 @@ func main() {
 [latest-release]: https://github.com/aliyun/alibaba-cloud-sdk-go/releases
 [go]: https://golang.org/dl/
 [endpoints]: https://developer.aliyun.com/endpoints
+[Requirements]: docs/0-Requirements-CN.md