Update __init__.py

Author: fkiraly

pypfopt/__init__.py

@@ -1,10 +1,16 @@
-from .black_litterman import (BlackLittermanModel,
-                              market_implied_prior_returns,
-                              market_implied_risk_aversion)
+from .black_litterman import (
+    BlackLittermanModel,
+    market_implied_prior_returns,
+    market_implied_risk_aversion,
+)
 from .cla import CLA
 from .discrete_allocation import DiscreteAllocation, get_latest_prices
-from .efficient_frontier import (EfficientCDaR, EfficientCVaR,
-                                 EfficientFrontier, EfficientSemivariance)
+from .efficient_frontier import (
+    EfficientCDaR,
+    EfficientCVaR,
+    EfficientFrontier,
+    EfficientSemivariance,
+)
 from .hierarchical_portfolio import HRPOpt
 from .risk_models import CovarianceShrinkage