docs: add missing history for res.download change

Author: dougwilson

History.md

@@ -11,6 +11,7 @@
 
   * Add `"json escape"` setting for `res.json` and `res.jsonp`
   * Add `express.json` and `express.urlencoded` to parse bodies
+  * Add `options` argument to `res.download`
   * Improve error message when autoloading invalid view engine
   * Improve error messages when non-function provided as middleware
   * Skip `Buffer` encoding when not generating ETag for small response