text: Title: greeting note from alphavantage raises an error
  Body: Reading currencies, alphavantage returns a greeting note ("welcome") and this note raises an error in alphavantage.py line 363.
  
  ```
              elif "Note" in json_response and self.treat_info_as_error:
                  raise ValueError(json_response["Note"])
  ```
  For this reason, alphavantage does not work in home assistant.
  