📝 Update readme

Author: ajayns

README.md

@@ -23,11 +23,17 @@ import React, { Component } from 'react';
 import OtpInput from 'react-otp-input';
 
 export default class App extends Component {
+  state = {
+    otp: '',
+  };
+
+  handleChange = otp => this.setState({ otp });
+
   render() {
     return (
       <div>
         <OtpInput
-          onChange={otp => console.log(otp)}
+          onChange={this.handleChange}
           numInputs={6}
           separator={<span>-</span>}
         />