alpha-vantage

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.

Hello @everyone 👋,

  ___      _     ___  ___                  
 / _ \    | |    |  \/  |                  
/ /_\ \___| | __ | .  . | ___              
|  _  / __| |/ / | |\/| |/ _ \             
| | | \__ \   <  | |  | |  __/             
\_| |_/___/_|\_\ \_|  |_/\___|             
                                           
                                           
  ___  

Let's try this out to speed up our CI:

https://pypi.org/project/pytest-xdist/

Some time ago, a new function CRYPTO_RATING was added to Alpha Vantage.

Add a function to Vantagex.Cryptocurrencies to call it, along with tests and documentation for it.