docs(README): change the readme

Author: lulutia

README.md

@@ -80,6 +80,7 @@ npm install react-native-picker-xg --save
 * Step2--init an react-native project
 * Step3--copy the zip's content into your project
 * Step4--change the index.android.js's last line ``AppRegistry.registerComponent('widgets', () => TpickerEx);``'s widgets into your project's name.
-* Step5--npm install
+* Step5--change the yourownip in line 19 in example/index.js to your own ip
+* Step6--npm install
 
 

example/index.js

@@ -14,7 +14,9 @@ import {
 import Test3, {CascadePicker} from '../app/pickerLogic/picker';
 import styles from './style';
 import {wheel2} from './data';
-const ip = 'http://172.18.47.119:3000/';
+
+// your own ip
+const ip = 'http://yourownip:3000/';
 
 
 export default class TpickerEx extends Component {