Defining __all__ for bias

Defining what to expose with wildcard.

sup3r/bias/__init__.py

@@ -1,7 +1,18 @@
 # -*- coding: utf-8 -*-
 """Bias calculation and correction modules."""
+
 from .bias_transforms import (global_linear_bc, local_linear_bc,
  monthly_local_linear_bc)
 from .bias_calc import (LinearCorrection, MonthlyLinearCorrection,
  SkillAssessment)
 from .qdm import QuantileDeltaMappingCorrection
+
+__all__ = [
+ "global_linear_bc",
+ "local_linear_bc",
+ "monthly_local_linear_bc",
+ "LinearCorrection",
+ "MonthlyLinearCorrection",
+ "QuantileDeltaMappingCorrection",
+ "SkillAssessment",
+]