title: Throwing "Uncaught ReferenceError: value is not defined" in react range slider
body: <p>I have followed the nodejs react range slider component instructions (<a href="https://www.npmjs.com/package/react-rangeslider" rel="nofollow">https://www.npmjs.com/package/react-rangeslider</a>). I have installed all dependencies but still i'm getting "value is not defined" error. I don't know why its happening.
  Here, i have included my code,</p>
  
  <pre><code>var React  = require('react');
  var Slider = require('react-rangeslider');
  
  var Volume = React.createClass({
      getInitialState: function(){
          return {
              value: 10,
          };
      },
      handleChange: function(value) {
          this.setState({
              value: value,
          });
      },
      render: function() {
          return (
              &lt;Slider value={value} orientation="vertical" onChange={this.handleChange} /&gt;
          );
      }
  });
  
  module.exports = Volume;
  </code></pre>