updating readme file

README.md

@@ -26,7 +26,7 @@ To install the stable version:
 
 #### Production
 
-You can access [these files on unpkg](https://unpkg.com/@microsoft/teams-js@1.3.4/dist/MicrosoftTeams.min.js), download them, or point your package manager to them.
+You can access [these files on unpkg](https://unpkg.com/@microsoft/teams-js@1.4.0-beta.0/dist/MicrosoftTeams.min.js), download them, or point your package manager to them.
 
 ## Usage
 
@@ -46,10 +46,10 @@ Reference the library inside of your `.html` page using:
 
 ```html
 <!-- Microsoft Teams JavaScript API (via CDN) -->
-<script src="https://unpkg.com/@microsoft/teams-js@1.3.4/dist/MicrosoftTeams.min.js" integrity="sha384-3zTjxw3msc6gKx3DseSU0lfRM129YrFjr2xgocfMIN/kBCdzJ88d+FSB1n3scUku" crossorigin="anonymous"></script>
+<script src="https://unpkg.com/@microsoft/teams-js@1.4.0-beta.0/dist/MicrosoftTeams.min.js" integrity="sha384-iw3J1uu47cqIME8+X6wHhOShkDGmNMhNT05YvuuRFp1Jhkq7dJc6fyAK1ZGBHrPP" crossorigin="anonymous"></script>
 
 <!-- Microsoft Teams JavaScript API (via npm) -->
-<script src="node_modules/@microsoft/teams-js@1.3.4/dist/MicrosoftTeams.min.js"></script>
+<script src="node_modules/@microsoft/teams-js@1.4.0-beta.0/dist/MicrosoftTeams.min.js"></script>
 
 <!-- Microsoft Teams JavaScript API (via local) -->
 <script src="MicrosoftTeams.min.js"></script>