Fix invalid period in type declaration
Fix invalid period in type declaration

Fixes https://github.com/thrasher-/gocryptotrader/issues/110

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