Added get_funding_rate_history method to exchange

freqtrade/optimize/backtesting.py

@@ -3,6 +3,7 @@
 """
 This module contains the backtesting logic
 """
+import ccxt
 import logging
 from collections import defaultdict
 from copy import deepcopy
@@ -125,6 +126,11 @@ class Backtesting:
 
         self.progress = BTProgress()
         self.abort = False
+
+        self.funding_rate_history = getattr(ccxt, self._exchange_name).load_funding_rate_history(
+            self.timerange.startts,
+            self.timerange.stopts
+        )
         self.init_backtest()
 
     def __del__(self):