doc: add aqrln to collaborators

Add Alexey Orlenko (@aqrln) to the list of collaborators in README.md

PR-URL: https://github.com/nodejs/node/pull/12273


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rich Trott <rtrott@gmail.com>