KNN.optimisedEuclideanPredict undefined (type *KNNClassifier has no field or method optimisedEuclideanPredict)

Hello, Dear

i'm use the package knn, but received a error in 133 line, i belive that the archive knn_opt_euclidean.go don't be imported correctly.

knn.go:132:16: KNN.optimisedEuclideanPredict undefined (type *KNNClassifier has no field or method optimisedEuclideanPredict)