Add @mhdawson back to the CTC

Now that the CTC has expanded, this PR calls for a vote of the CTC
to reinstate Michael Dawson (@mhdawson) as a full voting member.

Voted on and approved by the CTC on 2016-03-23

PR-URL: nodejs#5633
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Alexis Campailla <orangemocha@nodejs.org>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

README.md

@@ -146,6 +146,7 @@ information about the governance of the Node.js project, see
 * [fishrock123](https://github.com/fishrock123) - **Jeremiah Senkpiel** <fishrock123@rocketmail.com>
 * [indutny](https://github.com/indutny) - **Fedor Indutny** <fedor.indutny@gmail.com>
 * [jasnell](https://github.com/jasnell) - **James M Snell** <jasnell@gmail.com>
+* [mhdawson](https://github.com/mhdawson) - **Michael Dawson** <michael_dawson@ca.ibm.com>
 * [misterdjules](https://github.com/misterdjules) - **Julien Gilli** <jgilli@nodejs.org>
 * [mscdex](https://github.com/mscdex) - **Brian White** <mscdex@mscdex.net>
 * [ofrobots](https://github.com/ofrobots) - **Ali Ijaz Sheikh** <ofrobots@google.com>
@@ -174,7 +175,6 @@ information about the governance of the Node.js project, see
 * [lxe](https://github.com/lxe) - **Aleksey Smolenchuk** <lxe@lxe.co>
 * [matthewloring](https://github.com/matthewloring) - **Matthew Loring** <mattloring@google.com>
 * [mcollina](https://github.com/mcollina) - **Matteo Collina** <matteo.collina@gmail.com>
-* [mhdawson](https://github.com/mhdawson) - **Michael Dawson** <michael_dawson@ca.ibm.com>
 * [micnic](https://github.com/micnic) - **Nicu Micleușanu** <micnic90@gmail.com>
 * [mikeal](https://github.com/mikeal) - **Mikeal Rogers** <mikeal.rogers@gmail.com>
 * [monsanto](https://github.com/monsanto) - **Christopher Monsanto** <chris@monsan.to>