[GNC] YahooJSON API Non Functional Again

[Bruce Schuck]

The URL used for fetching quotes in YahooJSON (yahoo_json method) is 
once again not working.

Known issue, so please do not open a new issue at 
https://github.com/finance-quote/finance-quote/issues or 
https://rt.cpan.org//Dist/Display.html?Queue=Finance-Quote. I have 
reopened https://github.com/finance-quote/finance-quote/issues/264 and 
will look at using one of the alternative sources noted in the comments.

In the meantime I suggest switching to AlphaVantage (don't forget to 
acquire and set an API token). See 
https://www.alphavantage.co/support/#api-key

- Bruce S.