A small error in MultiTimestepRegressionExample.scala

[xiaocxt]

MultiTimestepRegressionExample.scala
line 123 and 124:

      //Run regression evaluation on our single column input
      val evaluation = new RegressionEvaluation(1)

should be:
val evaluation = new RegressionEvaluation(2)

ERROR:
Exception in thread "main" org.nd4j.linalg.exception.ND4JIllegalStateException: op.X length should be equal to op.Y length: [[2, 1, 2, 1, 1, 0, 1, 99]] != [[2, 1, 1, 1, 1, 0, 1, 99]]