depth chart is broken #628
Description
The depth chart is supposed to show the depth of the orderbook, but at the moment, it does not show anything.
See this picture from the README how it's supposed to work:
depth chart is broken because depth field has been removed in orderbook in mm2
(https://github.com/particle4dev/hyperdex/blob/master/app/renderer/components/DepthChart.js#L37)