text: Title: Add Deribit Funding from TICKER
  Body: Derbit has the funding rate in their Ticker channel.   It would be good to extract both the current and 8 hour funding.
  
  {
    "jsonrpc": "2.0",
    "id": 8106,
    "result": {
      "best_ask_amount": 3010
      "best_ask_price": 3562.75,
      "best_bid_amount": 135710,
      "best_bid_price": 3562.5,
      **"current_funding": 0,
      "funding_8h": 0.00018344,**
      "index_price": 3563.53,
      "instrument_name": "BTC-PERPETUAL",
      "last_price": 3562.25,
      "mark_price": 3562.62,
      "max_price": 3598.21,
      "min_price": 3526.96,
      "open_interest": 23126.924145440054,
      "settlement_price": 3573.77,
      "state": "open",
      "stats": {
        "volume": 85934.31950267,
        "low": 3492,
        "high": 3660.25
      },
      "timestamp": 1550153198202
    }