message: Add TSC stakeholder
  This changelist adds Dhruv Govil as the Apple stakeholder on the MaterialX TSC, as confirmed by vote at a recent TSC meeting.
diff: @@ -64,6 +64,7 @@ The current Stakeholders of the MaterialX TSC are:
  - Eric Bourque - Autodesk
  - Fran Gonzalez - Pixar RenderMan
  +- Dhruv Govil - Apple
  - Rafal Jaroszkiewicz - SideFX
  - Lee Kerley - Sony Pictures Imageworks
  - Lutz Kettner - NVIDIA
  