fixing backtesting and perisstence

freqtrade/aws/exchange.py

@@ -0,0 +1,14 @@
+
+def fetch_pairs (events, context):
+    """
+        fetches the pairs for the given exchange name and currency
+
+        requires:
+
+            name: name of the exchange
+            stake_currency: name of the stake currency
+
+    :param events:
+    :param context:
+    :return:
+    """