fix: update config readme (#1396)

* fix: updare config readme

* add appollo

config/README.md

@@ -1,27 +1,12 @@
 # Config
 
-## Consul
+## kube
-```shell
-go get -u github.com/go-kratos/kratos/registry/consul/v2
-```
-
-## Etcd
-```shell
-go get -u github.com/go-kratos/kratos/registry/etcd/v2
-```
-
-## zookeeper
-```shell
-go get -u github.com/go-kratos/kratos/registry/zookeeper/v2
-```
 
-## Nacos
 ```shell
-go get -u github.com/go-kratos/kratos/registry/nacos/v2
+go get -u github.com/go-kratos/kratos/config/kubernetes/v2
 ```
 
-## kube
+##apollo
-
 ```shell
-go get -u github.com/go-kratos/kratos/config/kubernetes/v2
+go get -u github.com/go-kratos/kratos/config/apollo/v2
 ```