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DiscretizerModelReader::load fails with Spark 2.1.1

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Steps to reproduce with [this dataset](https://github.com/MarcKaminski/stackoverflow/blob/master/datasets/cars.data) `spark-shell --jars "/path/to/spark-MDLP-discretization-1.3.jar"` ```scala import org.apache.spark.ml.{Pipeline, PipelineModel} import org.apache.spark.ml.feature._ val carsPath = "/path/to/cars.data" val mdlPath = "/path/to/save/mdl" val df = spark.read.option("header", true) .option("inferSchema", true)...