update readme

README.md

@@ -22,19 +22,3 @@ const valid = verifyTOTP(totp, key, 30, 6);
 ```
 npm i @oslojs/otp
 ```
-
-## Prerequisites
-
-This package requires the [Web Crypto API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API). This is available in most modern runtimes, including Node.js 20+, Deno, Bun, and Cloudflare Workers. The big exception is Node.js 16 and 18. Make sure to polyfill it using `webcrypto`.
-
-```ts
-import { webcrypto } from "node:crypto";
-
-globalThis.crypto = webcrypto;
-```
-
-Alternatively, add the `--experimental-global-webcrypto` flag when executing files.
-
-```
-node --experimental-global-webcrypto index.js
-```