DoubleML 0.5.0

• Implement a new score function score = 'IV-type' for the PLIV model (for details see #151)
  --> API change from DoubleMLPLIV(obj_dml_data, ml_g, ml_m, ml_r [, ...]) to DoubleMLPLIV(obj_dml_data, ml_g, ml_m, ml_r, ml_g [, ...])
• Adapt the nuisance estimation for the 'IV-type' score for the PLR model (for details see #151)
  --> API change from DoubleMLPLR(obj_dml_data, ml_g, ml_m [, ...]) to DoubleMLPLR(obj_dml_data, ml_l, ml_m, ml_g [, ...])
• Allow the usage of classifiers for binary outcome variables in the model classes IRM and IIVM #134
• Published in JMLR: DoubleML - An Object-Oriented Implementation of Double Machine Learning in Python (citation info updated in #138 )
• Maintenance #143 #148 #149 #152 #153