Fix some style violations

freqtrade/persistence/base.py

@@ -4,5 +4,6 @@ from sqlalchemy.orm import DeclarativeBase, Session, scoped_session
 
 SessionType = scoped_session[Session]
 
+
 class ModelBase(DeclarativeBase):
     pass

freqtrade/persistence/models.py

@@ -10,7 +10,7 @@ from sqlalchemy.orm import scoped_session, sessionmaker
 from sqlalchemy.pool import StaticPool
 
 from freqtrade.exceptions import OperationalException
-from freqtrade.persistence.base import ModelBase, SessionType
+from freqtrade.persistence.base import ModelBase
 from freqtrade.persistence.migrations import check_migrate
 from freqtrade.persistence.pairlock import PairLock
 from freqtrade.persistence.trade_model import Order, Trade