doc: add phillipj to collaborators

PR-URL: #5663
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Jeremy Whitlock <jwhitlock@apache.org>

Author: phillipj

README.md

@@ -415,6 +415,7 @@ information about the governance of the Node.js project, see
 * [monsanto](https://github.com/monsanto) - **Christopher Monsanto** <chris@monsan.to>
 * [Olegas](https://github.com/Olegas) - **Oleg Elifantiev** <oleg@elifantiev.ru>
 * [petkaantonov](https://github.com/petkaantonov) - **Petka Antonov** <petka_antonov@hotmail.com>
+* [phillipj](https://github.com/phillipj) - **Phillip Johnsen** <johphi@gmail.com>
 * [qard](https://github.com/qard) - **Stephen Belanger** <admin@stephenbelanger.com>
 * [rlidwka](https://github.com/rlidwka) - **Alex Kocharin** <alex@kocharin.ru>
 * [rmg](https://github.com/rmg) - **Ryan Graham** <r.m.graham@gmail.com>