docs(readme): fix page.pdf code example (#6890)

Ref: `PaperFormat` type.
puppeteer · Feb 18, 2021 · d66389b · d66389b
1 parent f7de60b
commit d66389b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -106,7 +106,7 @@ const puppeteer = require('puppeteer');
   await page.goto('https://news.ycombinator.com', {
     waitUntil: 'networkidle2',
   });
-  await page.pdf({ path: 'hn.pdf', format: 'A4' });
+  await page.pdf({ path: 'hn.pdf', format: 'a4' });
 
   await browser.close();
 })();