Fix feature_names_in_ attribute for knn_transformer in exercise 4 #110
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Originally, self.feature_names_in_ was assigned to have the same value as self.estimator.feature_names_in_ but I think this is incorrect because self.estimator is not yet fitted. The fitted estimator is self.estimator_, so self_feature_names_in_ should be equal to self.estimator_.feature_names_in_. (Note the added _)
Attempting to access knn_transformer.feature_names_in_ with the original code, would result in an error stating that the attribute doesn't exist, but with this small change it outputs ['latitude', 'longitude'], which is the excpected output