Merge pull request #75 from huangshuni/master

更新版本号为2.2.1

Author: huangshuni

package.json

@@ -5,7 +5,7 @@
   "author"     : "wicked.tc130",
   "license"    : "ISC",
   "main"       : "index.js",
-  "version"    : "2.2.0",
+  "version"    : "2.2.1",
   "repository" : {
     "type": "git",
     "url": "https://github.com/jpush/jcore-react-native"