doc: add imyller to collaborators

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>

PR-URL: #8530
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

Author: imyller

README.md

@@ -231,6 +231,8 @@ more information about the governance of the Node.js project, see
 **Wyatt Preul** <wpreul@gmail.com>
 * [iarna](https://github.com/iarna) -
 **Rebecca Turner** <me@re-becca.org>
+* [imyller](https://github.com/imyller) -
+**Ilkka Myller** <ilkka.myller@nodefield.com>
 * [isaacs](https://github.com/isaacs) -
 **Isaac Z. Schlueter** <i@izs.me>
 * [iWuzHere](https://github.com/iWuzHere) -