text: Title: [Bug]: 'Stock' object has no attribute 'df'
  Body: ### Is there an existing issue for this?
  
  - [X] I have searched the existing issues
  
  ### Current Behavior
  
  I get the following error and could not check if data is updated:
  `'Stock' object has no attribute 'df'`
  
  
  ### Expected Behavior
  
  I should not get any error and I should be able to check if data is updated
  
  ### Steps To Reproduce
  
  ```markdown
  Python 3.7 64bit
  Alpaca-trade-api 2.0.0
  ```
  
  
  ### Anything else?
  
  The bot was running ok with Alpaca-trade-api version__ = '0.42'
  The error is present after upgrade to Alpaca-trade-api 2.0.0