Typo in `unenv` npm README

[recanman]

Describe the change

Looking at the first preset (node), the sample code is the following:

import { env, nodeless } from "unenv";

const envConfig = env(node, {});

when it should be:

import { env, node } from "unenv";

const envConfig = env(node, {});

The npm README is not equivalent to the repo's README, so I couldn't make a PR. Anyways, this is a simple fix.

URLs

https://www.npmjs.com/package/unenv?activeTab=readme

Additional information

• Would you be willing to help?