Updated config_example.json to include Ethereum for Bitfinex.
Updated config_example.json to include Ethereum for Bitfinex.

thrasher-/gocryptotrader,thrasher-/gocryptotrader,snipesjr/gocryptotrader,snipesjr/gocryptotrader,jmaurice/gocryptotrader,thrasher-/gocryptotrader,thrasher-/gocryptotrader,thrasher-/gocryptotrader,snipesjr/gocryptotrader,snipesjr/gocryptotrader