Lazypredict

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* Updated the default version to 3.9

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* Fixed issue with older version of Scikit-learn
* Reduced dependencies sctrictly to few

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* Removed StackingRegressor and CheckingClassifier.
* Added provided_models method.
* Added adjusted r-squared metric.
* Added cardinality check to split categorical columns into low and high cardinality features.
* Added different transformation pipeline for low and high cardinality features.
* Included all number dtypes as inputs.
* Fixed dependencies.
* Improved documentation.

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* Removed catboost regressor and classifier

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* Added xgboost, lightgbm, catboost regressors and classifiers

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* Removed troublesome regressors from list of CLASSIFIERS