udpate docs

Author: huangminlinux

README.md

@@ -10,6 +10,20 @@ npm install jcore-react-native --save（目前 jmessage-react-plugin 2.1.1 版
 react-native link
 ```
 
+##### （如果是原生应用集成 react-native）使用 CocoaPods 安装
+
+在 Podfile 中添加如下代码:
+
+```
+pod 'JPushRN', :path => '../node_modules/jpush-react-native'
+```
+
+终端执行如下指令:
+
+```
+pod install
+```
+
 ## 配置
 
 #### Android

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jmessage-react-plugin",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "a jmessage plugin for react native application",
   "main": "index.js",
   "repository": {