readme: update exemple t odump links

Author: krichprollsch

README.md

@@ -83,10 +83,20 @@ const browser = await puppeteer.connect({
 const context = await browser.createBrowserContext();
 const page = await context.newPage();
 
+// Dump all the links from the page.
 await page.goto('https://wikipedia.com/');
 
+const links = await page.evaluate(() => {
+  return Array.from(document.querySelectorAll('a')).map(row => {
+    return row.getAttribute('href');
+  });
+});
+
+console.log(links);
+
 await page.close();
 await context.close();
+await browser.disconnect();
 ```
 
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