(Enjoying the library, thanks for making it available)

I noticed the brush doesn't work with touch interactivity on mobile. Example here: https://vx-demo.now.sh/brush

After digging into the code a bit, I noticed that mobile events don't seem to be wired up for the Drag component. Shouldn't drag include touch and touchmove the same way as mouse and mousemove?

https://github.com/airbnb/visx/blob/master/packages/visx-drag/src/Drag.tsx#L121-L122

I could give it a shot if this is unintended and no one has time to look into it or is currently doing so. Lmk