Version in readme

Author: Nathan Zylbersztejn

README.md

@@ -20,7 +20,7 @@ A simple webchat widget to connect with a chatbot. Forked from [react-chat-widge
 In your `<body/>`:
 ```javascript
 <div id="webchat"/>
-<script src="https://storage.googleapis.com/mrbot-cdn/webchat-0.5.0.js"></script>
+<script src="https://storage.googleapis.com/mrbot-cdn/webchat-0.5.1.js"></script>
 <script>
   WebChat.default.init({
     selector: "#webchat",