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* added: ignore option for one-hot-encoding
* fixed: external dependency in unit test
* fixed: gaps in ordinal encoding if nan values are present
* fixed: sklearn compliance: add `feature_names_in_` attribute
* fixed: sklearn compliance: `get_feature_names_out` function has the correct signature
* fixed: add RankHotEncoder in documentation
* fixed: return correct mapping in one hot encoder `category_mapping` property (issue 256)
* refactor: quadratic runtime in ordinal encoder (issue 407)