README.md - Library imports

[lgleznah]

Good morning.

I write this issue because I've had some trouble getting the library to work. The thing is, in the main README file, there is this piece of code:

// This will be all that you need
import io.radicalbit.flink.pmml.scala._

import org.apache.flink.ml.math.Vector
import org.apache.flink.streaming.api.scala._

object FlinkJpmmlExample {
  def main(args: Array[String]): Unit = {

    // your model can reside in any Flink supported backend
    val pathToPmml = "/even/to/distributed/systems"

    val env = StreamExecutionEnvironment.getExecutionEnvironment
    val events = env.yourInputStream

    //  a lazy reader implementation
    val reader = ModelReader(pathToPmml)

However, I couldn't get this piece of code to work. After searching through the repo, I found that an additional import was required:

import io.radicalbit.flink.pmml.scala.api.reader.ModelReader

Could this import be added to the README example? I know it's already in the examples, but not having it in the main README file could be misleading.

For reference, I tried this on an Ubuntu 18.04 VM, working with Flink 1.9.0 and Scala 2.11.12, compiled with sbt 1.0.