Update the homepage support table.
Update the homepage support table.

Mention our good ES 3.0 support. Also mention our multiplatform and
Vulkan support.

BUG=None

Change-Id: Ib2a3f94b56ecf3a3b20b960b3270ebbc8948a628
Reviewed-on: https://chromium-review.googlesource.com/367755
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Shannon Woods <0f3694938fd5703bd548127ee497e4d604509bef@chromium.org>

MSOpenTech/angle,MSOpenTech/angle,ecoal95/angle,ppy/angle,ppy/angle,ecoal95/angle,MSOpenTech/angle,ppy/angle,ecoal95/angle,MSOpenTech/angle,ppy/angle,ecoal95/angle,ecoal95/angle