v2.1.0

• New endpoint: Stock Price
  https://github.com/frefrik/ark-invest-api#stock-price-v2

  {
    "symbol": "TSLA",
    "exchange": "NasdaqGS",
    "currency": "USD",
    "price": 793.61,
    "change": 10.859985,
    "changep": 1.3874142,
    "last_trade": "2021-10-07T20:00:02"
  }

• Add share_price to ETF Holdings
  https://github.com/frefrik/ark-invest-api#etf-holdings-v2

  {
    "symbol": "ARKK",
    "date_from": "2021-10-08",
    "date_to": "2021-10-08",
    "holdings": [
      {
        "date": "2021-10-08",
        "ticker": "TSLA",
        "company": "TESLA INC",
        "cusip": "88160R101",
        "shares": 2469443,
        "market_value": 1959774659.23,
        "share_price": 793.61,
        "weight": 9.65,
        "weight_rank": 1
      }]
  }