Changelog for coinbase-pro-0.7.0.0

Version 0.7.0.0

Unauthenticated requests are now all in the ClientM monad. CoinbasePro.Request.run is now required to operate in the IO monad.

Example: run (trades (ProductId "BTC-USD")) >>= print
Added run_, runSandbox, runSandboxWithManager in CoinbasePro.Request
Added currencies, fees, and trailingVolume queries