Fix non-current date problem in exchange rates

services/exchangerates.py

@@ -22,7 +22,7 @@ class ExchangeRates(object):
             try:
                 data = requests.get(API_URL).json()
                 base, rates = data['base'], data['rates']
-                self.cache[data['date']] = base, rates
+                self.cache[today] = base, rates
             except Exception as e:
                 raise ExchangeRatesError(str(e))
         return base, rates