Update README.md

Edward Xiao · web-flow · commit a84cec27073a · 2020-03-25T09:48:04.000+08:00
diff --git a/README.md b/README.md
@@ -37,17 +37,17 @@ import 'react-inputs-validation/lib/react-inputs-validation.min.css';
   }
 ```
 
-#### By CDN
+#### By CDN (make sure using >= v4.4.1)
 ```html
 <head>
   ...
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/react-inputs-validation/4.4.0/react-inputs-validation.min.css"/>
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/react-inputs-validation/4.4.1/react-inputs-validation.min.css"/>
 </head>
 <body>
  <div id="root"></div>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>
- <script src="https://cdnjs.cloudflare.com/ajax/libs/react-inputs-validation/4.4.0/react-inputs-validation.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/react-inputs-validation/4.4.1/react-inputs-validation.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.21.1/babel.min.js"></script>
  <script type="text/babel">
   class App extends React.Component {
