doc: add rmg to collaborators
doc: add rmg to collaborators

PR-URL: https://github.com/nodejs/node/pull/4219
Reviewed-By: Jeremiah Senkpiel <f1782d15e31ad502ea2c097c21cc235811d0cb7c@rocketmail.com>
Reviewed-By: Calvin Metcalf <a50685d65b700ffdcbfbd832b673f8238033586a@gmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node