Update version to 0.2.2.

PiperOrigin-RevId: 277631589

Update version to 0.2.1

PiperOrigin-RevId: 276127928

Update setup.py to version 0.2.0.

PiperOrigin-RevId: 274880162

Update prerequisite to TF 1.14 (to include vectorized_map).

PiperOrigin-RevId: 267482807

update name for PYPI release

PiperOrigin-RevId: 265069047