Merge pull request #5 from aliyun/alpha2

Alpha2

.gitignore

 .idea
 .DS_Store
 Example/ios/Pods/
-package-lock.json
+package-lock.json
+Example/ios/Example.xcodeproj/project.pbxproj
+ios/RNAliyunOSS.xcodeproj/project.xcworkspace/
+Example/package-lock.json

CHANGELOG.md

+CHANGELOG.md

Example/package.json

     "test": "jest"
   },
   "dependencies": {
-    "aliyun-oss-react-native": "^1.0.0-alpha.1",
-    "react": "16.0.0-alpha.6",
-    "react-native": "0.44.3",
+    "react": "16.3.1",
+    "react-native": "0.55.4",
+    "aliyun-oss-react-native": "^1.0.0-alpha.2",
     "react-native-image-picker": "^0.26.10"
   },
   "devDependencies": {
-    "babel-jest": "23.0.1",
+    "babel-jest": "23.2.0",
     "babel-preset-react-native": "4.0.0",
-    "jest": "23.1.0",
+    "jest": "23.2.0",
     "react-test-renderer": "16.3.1"
   },
   "jest": {

README-CN.md

 # Aliyun OSS SDK for React Native
 
-## [README of English](#https://github.com/aliyun/aliyun-oss-react-native/blob/develop/README.md)
+## [README of English](https://github.com/aliyun/aliyun-oss-react-native/blob/develop/README.md)
 
 ## 简介
 

README.md

 # Alibaba Cloud OSS SDK for React Native
 
-## [README of Chinese](#https://github.com/aliyun/aliyun-oss-react-native/blob/develop/README-CN.md)
+## [README of Chinese](https://github.com/aliyun/aliyun-oss-react-native/blob/develop/README-CN.md)
 
 ## Introduction
 

UPGRADING.md

+UPGRADING.md

package.json

 {
   "name": "aliyun-oss-react-native",
-  "version": "1.0.0-alpha.1",
+  "version": "1.0.0-alpha.2",
   "description": "React Native SDK for aliyun object storage service",
   "main": "index.js",
   "scripts": {