6.1.0

• error message in hotdeck() when ord_var and variable overlap
• family argument of class 'family' now work in regressionImp
• add new vignettes explaining all remaining imputation methods (irmi(), kNN(), hotdeck() and regressionImp()). Thanks @wolfgangrannetbauer (#44, #45)
• Allow missing and imputed values in several visualization functions.
• The new functionalities are showcased in the new visualization vignette (#46). Thanks @wolfgangrannetbauer!
• Add tableMiss(): A table that highlights missing and imputed values via colors (#47).
• Bug fix for kNN (#48) Thanks @torockel