Update README.md for UMD bundle v0.2.1

Author: stdlib-bot

README.md

@@ -54,7 +54,7 @@ limitations under the License.
 To use in Observable,
 
 ```javascript
-SharedArrayBuffer = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/array-shared-buffer@umd/browser.js' )
+SharedArrayBuffer = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/array-shared-buffer@v0.2.1-umd/browser.js' )
 ```
 
 To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
@@ -66,7 +66,7 @@ var SharedArrayBuffer = require( 'path/to/vendor/umd/array-shared-buffer/index.j
 To include the bundle in a webpage,
 
 ```html
-<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-shared-buffer@umd/browser.js"></script>
+<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-shared-buffer@v0.2.1-umd/browser.js"></script>
 ```
 
 If no recognized module system is present, access bundle contents via the global scope:
@@ -247,7 +247,7 @@ try {
 <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@umd/browser.js"></script>
 <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@umd/browser.js"></script>
 <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/number-uint8-base-to-binary-string@umd/browser.js"></script>
-<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-shared-buffer@umd/browser.js"></script>
+<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/array-shared-buffer@v0.2.1-umd/browser.js"></script>
 <script type="text/javascript">
 (function () {