text: Title: Issue running vwap with dataframe index from yFinance data
  Body: **Which version are you running? The lastest version is on Github. Pip is for major releases.**
  ```python
  import pandas_ta as ta
  print(ta.version)
  ```
  0.3.14b0
  
  **Do you have _TA Lib_ also installed in your environment?**
  ```sh
  $ pip list
  ```
  no
  
  **Did you upgrade? Did the upgrade resolve the issue?**
  ```sh
  $ pip install -U git+https://github.com/twopirllc/pandas-ta
  ```
  yes but didn't resolve the issue
  **Describe the bug**
  I'm trying to run the simple example to calculate the vwap. Since it's provided, the vwap requires the datetime indexing.
  However, the data coming via yFinance doesn't have this column and we get the key error for the dataframe
  
  **To Reproduce**
  ```python
  import pandas as pd
  import pandas_ta as ta
  
  df = pd.DataFrame()
  df = df.ta.ticker("aapl", period="9d", interval="5m")
  
  df.set_index(pd.DatetimeIndex(df["datetime"]), inplace=True)
  print(df.columns)
  df.ta.vwap(append=True)
  ```
  **Screenshots**
  ![image](https://user-images.githubusercontent.com/4449380/159678191-7a639b18-34b1-40fd-95e0-56e146be433d.png)
  
  
  Thanks for using Pandas TA!
  