Add seq2seq job to init file.

Author: TheMichaelHu

google/cloud/aiplatform/__init__.py

@@ -63,6 +63,7 @@
  CustomPythonPackageTrainingJob,
  AutoMLTabularTrainingJob,
  AutoMLForecastingTrainingJob,
+ SequenceToSequencePlusForecastingTrainingJob,
  AutoMLImageTrainingJob,
  AutoMLTextTrainingJob,
  AutoMLVideoTrainingJob,
@@ -116,6 +117,7 @@
  "Model",
  "ModelEvaluation",
  "PipelineJob",
+ "SequenceToSequencePlusForecastingTrainingJob",
  "TabularDataset",
  "Tensorboard",
  "TensorboardExperiment",