pyrh: quote_data fails with InvalidTickerSymbol - quotes endpoint requires auth token now

GET requests for quotes now require that you pass your access token.

For anyone looking for a quick fix to the problem, in your quote_data and quotes_data functions in Robinhood.py, replace:

req = requests.get(url, timeout=15)

with:

req = requests.get(url, headers=self.headers, timeout=15)

which will pass your auth token with your quotes request.

For any future PR, make sure to change the InvalidTickerSymbol() raise, because it’s not really accurate.

s/o to https://github.com/Ladinn/algotrader/issues/11 for the idea!