Small formatting upgrades

freqtrade/strategy/hyper.py

@@ -292,7 +292,7 @@ class BooleanParameter(CategoricalParameter):
                          load=load, **kwargs)
 
 
-class HyperStrategyMixin(object):
+class HyperStrategyMixin:
     """
     A helper base class which allows HyperOptAuto class to reuse implementations of buy/sell
      strategy logic.

freqtrade/strategy/interface.py

@@ -30,7 +30,7 @@ logger = logging.getLogger(__name__)
 CUSTOM_SELL_MAX_LENGTH = 64
 
 
-class SellCheckTuple(object):
+class SellCheckTuple:
     """
     NamedTuple for Sell type + reason
     """