refresh readme

Author: xwenliang

README.md

@@ -4,12 +4,12 @@ PickerAndroid has PickerIOS interface in pure javascript
 
 Needs react-native >= 0.14.2
 
-![ui](./doc/ui.gif)
-
 ###Documentation
 
-- selectedValue any
-- onValueChange function
+- <b>selectedValue</b> any
+- <b>onValueChange</b> function
+- <b>moveUp</b> when called, the wheel will go up, which will trigger onValueChange
+- <b>moveDown</b> when called, the wheel will go down, which will trigger onValueChange too.
 
 ###Usage
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native-picker-android",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "description": "react-native-picker-android",
   "main": "index.js",
   "scripts": {