kelp showing/using overly rounded/low-preicision prices

[paul-token]

Describe the bug

When using ccxt via DATA_FEED_B_URL="ccxt-poloniex/ETH/USDT" in buysell.cfg, kelp's logs are showing 2019/02/21 00:56:42 price from exchange feed (ccxt-bittrex/ETH/USDT): bidPrice=147.0000000, askPrice=148.0000000, centerPrice=147.5000000, which seems to be overly rounded, whereas querying ccxt directly results in correct/more-precise prices.

Expected behavior

kelp should pull in (and use) more accurate prices when possible (for example, when using sdex)

Frequency

Seems to be always

Steps To Reproduce

Set up ccxt via DATA_FEED_B_URL="ccxt-poloniex/ETH/USDT" in a buysell.cfg

Your Environment

version: fixed_fee:v1.4.0-3-ga0362947
git branch: fixed_fee
git hash: a036294
build date: 20190220T231403Z
GOOS: linux
GOARCH: amd64

Context

With too low a precision value there are many cases where no trades will ever be made even though there could be a ~1% difference in certain assets (for example, with ETH)