Fix readme example comment (#1505)

Co-authored-by: Sindre Sorhus <[email protected]>

readme.md

@@ -112,7 +112,7 @@ const pipeline = promisify(stream.pipeline);
  fs.createWriteStream('index.html')
  );
 
- // For POST, PUT, and PATCH methods `got.stream` returns a `stream.Writable`
+ // For POST, PUT, PATCH, and DELETE methods, `got.stream` returns a `stream.Writable`.
  await pipeline(
  fs.createReadStream('index.html'),
  got.stream.post('https://sindresorhus.com')