Bump version to 1.18.2 (aws#615)

Bump version to 1.18.1 (aws#611)

Bumping up version to 1.18.0 for horovod release (aws#604)

* Bumping up version to 1.18.0 for horovod release

Support VPC config for hyperparameter tuning and bump version to 1.17…

….2 (aws#598)

Supporting inter-container traffic encryption flag (aws#595)

Upgrade version to 1.17.0 (aws#592)

Upgrade version to 1.16.3 (aws#564)

Add support for Hyperparameter Tuning Early Stopping (aws#550)

Update version to 1.16.1.post1 (aws#516)

update sdk for new re:invent 2018 features