Bug fix: params were not being sent to coinbase api.
Bug fix: params were not being sent to coinbase api.

The call to _send_message was missing the params so the function was not respecting the datetime and granularity parameters when requesting data from coinbase api. So the request would always return whatever data coinbase decided to give to you.
danpaquin/GDAX-Python,danpaquin/coinbase-gdax-python