doc: add Сковорода Никита Андреевич to the CTC

Approved at CTC meeting
https://github.com/nodejs/node/issues/5409
Reviewers are CTC members who voted for this.

PR-URL: https://github.com/nodejs/node/pull/5278


Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Shigeki Ohtsu <ohtsu@iij.ad.jp>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Alexis Campailla <alexis@janeasystems.com>
Reviewed-By: Chris Dickinson <chris@neversaw.us>