update README.md

README.md

@@ -28,7 +28,9 @@ Node.js >= 6.0.0 required.
 
 * See [examples](https://github.com/Quinton/node-apollo/tree/master/example)
 
-## remoteConfigService
+## Method
+
+### remoteConfigService
 ```
   const config = {
       configServerUrl: 'http://example.com',
@@ -42,7 +44,7 @@ Node.js >= 6.0.0 required.
   const result = await apollo.remoteConfigService(config);
 ```
   >**NOTE:** 读取携程Apollo配置，调用第三方应用接入Apollo开放平台， 详情请参考[Apollo开放平台](https://github.com/ctripcorp/apollo/wiki/Apollo%E5%BC%80%E6%94%BE%E5%B9%B3%E5%8F%B0).
-## createEnvFile
+### createEnvFile
 ```
   const obj = {
       mongoose: 'mongo://127.0.0.1:27017',
@@ -51,7 +53,7 @@ Node.js >= 6.0.0 required.
   apollo.createEnvFile(eggConfig);
 ```
 >**NOTE:** 生成环境变量文件，常用于docker化项目，详细请参考[example](https://github.com/Quinton/node-apollo/tree/master/example).
-## setEnv
+### setEnv
 ```
 apollo.setEnv();
 ```