Fix: unknown prop 'redraw' warning in React v15.2

React v15.2 warns when a DOM element is rendered with an invalid property (see https://fb.me/react-unknown-prop)

lib/core.js

@@ -3,6 +3,7 @@ var ReactDOM = require('react-dom');
 
 module.exports = {
   createClass: function(chartType, methodNames, dataKey) {
+    var excludedProps = ['data', 'options', 'redraw'];
     var classData = {
       displayName: chartType + 'Chart',
       getInitialState: function() { return {}; },
@@ -12,7 +13,7 @@ module.exports = {
         };
         for (var name in this.props) {
           if (this.props.hasOwnProperty(name)) {
-            if (name !== 'data' && name !== 'options') {
+            if (excludedProps.indexOf(name) === -1) {
               _props[name] = this.props[name];
             }
           }