docs(README): replace CJS with ESM imports

Author: wolfy1339

README.md

@@ -87,8 +87,7 @@ Node
 Install with <code>npm install @octokit/request</code>
 
 ```js
-const { request } = require("@octokit/request");
-// or: import { request } from "@octokit/request";
+import { request } from "@octokit/request";
 ```
 
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