error messages use different precision

[darren-liu]

ERROR: {"codespace":6,"code":401,"abci_code":393617,"message":"quantity(10) is not rounded to lotSize(0.10000000)"}

	if msg.Quantity <= 0 || msg.Quantity%pair.LotSize.ToInt64() != 0 {
		return errors.New(fmt.Sprintf("quantity(%v) is not rounded to lotSize(%v)", msg.Quantity, pair.LotSize))
	}

	if msg.Price <= 0 || msg.Price%pair.TickSize.ToInt64() != 0 {
		return errors.New(fmt.Sprintf("price(%v) is not rounded to tickSize(%v)", msg.Price, pair.TickSize))
	}