fix rst warnings (aws#381)

* fix rst warnings

* fix typo

* fix image link

* update version to 1.9.3.1

Increase version to 1.9.3 (aws#379)

Support tensorflow 1.9 and bump version to 1.9.2 (aws#365)

Bump version to 1.9.1 (aws#360)

Add MXNet 1.2.1 and bump SDK to v1.9.0 (aws#336)

Bump version to 1.8.0 (aws#329)

Check if SecondaryStatusTransitions for previous DescribeTrainingJob …

…call (aws#325)

bump to 1.7.1 (aws#313)

Add support for Batch Transform and update README with TF Pipe Mode (a…

…ws#298)

Bump version to 1.6.1 (aws#288)