Add iche033 to PMC (#533)

Signed-off-by: Ian Chen <ichen@openrobotics.org>

Author: iche033

governance.md

@@ -52,8 +52,9 @@ The Gazebo PMC currently consists of the following individuals:
 
 | Name                 | Affiliation                                | Github Handle                                   | PMC Role       | Time Zone (optional)   |
 | -------------------- | ------------------------------------------ | ----------------------------------------------- | -------------- | ---------------------- |
-| Benjamin Perseghetti | [Rudis Labs](https://github.com/rudislabs) | [bperseghetti](https://github.com/bperseghetti) | Member         | EST (UTC-5)/EDT(UTC-4) |
-| Addisu Z. Taddese    | [Intrinsic](https://www.intrinsic.ai/)     | [azeey](https://github.com/azeey)               | Project Leader | 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) |
+| Benjamin Perseghetti | [Rudis Labs](https://github.com/rudislabs) | [bperseghetti](https://github.com/bperseghetti) | Member         | EST (UTC-5)/EDT (UTC-4) |
+| Addisu Z. Taddese    | [Intrinsic](https://www.intrinsic.ai/)     | [azeey](https://github.com/azeey)               | Project Leader | CST (UTC-6)/CDT (UTC-5) |
 
 ## Current Gazebo Committers