message: allow zero spread one-to-one price
diff: @@ -48,7 +48,7 @@ const checkCanCreateCurrentOrder = (tickerOrder, orderType) =>
  : tickerOrder[orderType]
  const checkHaveSpread = (tickerOrder, orderType) =>
  - tickerOrder[`spread${orderType === 'buy' ? 'Buy' : 'Sell'}`] > 0
  + tickerOrder[`spread${orderType === 'buy' ? 'Buy' : 'Sell'}`] >= 0
  ? true
  : false
  