Add mjcarroll to PMC list (#545)

Signed-off-by: Michael Carroll <[email protected]>

governance.md

@@ -53,6 +53,7 @@ The Gazebo PMC currently consists of the following individuals:
 | Name                 | Affiliation                                    | Github Handle                                   | PMC Role       | Time Zone (optional)    |
 | -------------------- | ---------------------------------------------- | ----------------------------------------------- | -------------- | ----------------------- |
 | Carlos Agüero        | [Honu Robotics](https://www.honurobotics.com/) | [caguero](https://github.com/caguero)           | Member         | CET (UTC+2)/CET (UTC+1) |
+| Michael Carroll      | [Intrinsic](https://www.intrinsic.ai/)         | [mjcarroll](https://github.com/mjcarroll)       | Member         | CST (UTC-6)/CDT (UTC-5) | 
 | Ian Chen             | [Intrinsic](https://www.intrinsic.ai/)         | [iche033](https://github.com/iche033)           | Member         | PST (UTC-8)/PDT (UTC-7) |
 | Alejandro Hernández  | [Honu Robotics](https://www.honurobotics.com/) | [ahcorde](https://github.com/ahcorde)           | Member         | CET (UTC+2)/CET (UTC+1) |
 | Benjamin Perseghetti | [Rudis Labs](https://github.com/rudislabs)     | [bperseghetti](https://github.com/bperseghetti) | Member         | EST (UTC-5)/EDT (UTC-4) |