title: Yfinance data not plotting with mplfinance
body: <p>I'm trying to plot simple stock data using yfinance and mplfinance, however I keep running into issues with datetimes (I believe). This is what I have so far.</p>
  <p>Here is a portion of the dataframe that I'm using.</p>
  <pre><code>Date       Open                High              Low                Close          Adj Close        Volume
  2020-01-02 17.6299991607666   17.700000762939453 16.329999923706055 16.39999961853 16.39999961853  3668700
  2020-01-03 16.350000381469727 16.729999542236328 15.8100004196167   16.01000022888 16.01000022888  2280600
  2020-01-06 16.170000076293945 16.190000534057617 15.260000228881836 15.5           15.5            3035700
  2020-01-07 15.619999885559082 15.670000076293945 15.199999809265137 15.32999992375 15.3299999      2038700
  </code></pre>
  <pre><code>import pandas as pd
  import numpy as np
  import matplotlib.pyplot as plt
  import mplfinance as mpf
  import talib
  import yfinance as yf
  
  stock = yf.download('MSFT', '2020-1-1','2020-07-07')
  stock.index = pd.to_datetime(stock.index)
  stock = stock[['Open', 'High', 'Low', 'Close', 'Volume']]
  
  inputs = {
      'open': stock['Open'],
      'high': stock['High'],
      'low': stock['Low'],
      'close': stock['Close'],
      'volume': stock['Volume']
  }
  
  close = talib.SMA(stock['Close'])
  
  from talib import MA_Type
  
  upper, middle, lower = talib.BBANDS(close, matype=MA_Type.T3)
  
  output = talib.MOM(close, timeperiod=5)
  
  mpf.plot(stock)
  plt.plot(upper)
  plt.plot(middle)
  plt.plot(lower)
  plt.show()
  </code></pre>
  <p>I keep getting this error when plotting it however. I don't know where the &quot;-36881.641&quot; is coming from</p>
  <pre><code>ValueError: view limit minimum -36881.641796875 is less than 1 and is an invalid Matplotlib date value. This often happens if you pass a non-datetime value to an axis that has datetime units
  </code></pre>