Update README.md for Deno bundle v0.2.1

Author: stdlib-bot

README.md

@@ -71,7 +71,7 @@ where `τ` is the period, `a` is the amplitude, and `φ` is the phase offset.
 ## Usage
 
 ```javascript
-import iterSquareWave from 'https://cdn.jsdelivr.net/gh/stdlib-js/simulate-iter-square-wave@deno/mod.js';
+import iterSquareWave from 'https://cdn.jsdelivr.net/gh/stdlib-js/simulate-iter-square-wave@v0.2.1-deno/mod.js';
 ```
 
 #### iterSquareWave( \[options] )
@@ -237,7 +237,7 @@ var bool = it.next().done;
 <!-- eslint no-undef: "error" -->
 
 ```javascript
-import iterSquareWave from 'https://cdn.jsdelivr.net/gh/stdlib-js/simulate-iter-square-wave@deno/mod.js';
+import iterSquareWave from 'https://cdn.jsdelivr.net/gh/stdlib-js/simulate-iter-square-wave@v0.2.1-deno/mod.js';
 
 // Create an iterator:
 var opts = {