Apply isort to freqtrade codebase

freqtrade/templates/sample_hyperopt_loss.py

@@ -1,10 +1,11 @@
-from math import exp
 from datetime import datetime
+from math import exp
 
 from pandas import DataFrame
 
 from freqtrade.optimize.hyperopt import IHyperOptLoss
 
+
 # Define some constants:
 
 # set TARGET_TRADES to suit your number concurrent trades so its realistic