upgrade dependencies to latest versions and fix bugs

assets/js/options.jsx

@@ -5,11 +5,12 @@ global.jQuery = require('jquery');
 require('bootstrap');
 
 var React = require('react');
+var ReactDOM = require('react-dom');
 
 // React components
 var Options = require('./components/Options.jsx');
 
-React.render(
+ReactDOM.render(
     <Options />,
     document.getElementById('wakatime-options')
-);
+);