Fixed python example in README
Fixed python example in README

lpfann/fri,vighneshbirodkar/sklearn-stub,vighneshbirodkar/lazyboost,vighneshbirodkar/sklearn-stub,scikit-learn-contrib/scikit-learn-extra,svaante/decision-tree-id3,svaante/decision-tree-id3,vighneshbirodkar/lazyboost,scikit-learn-contrib/project-template