Major Features and Improvements
* Add promote for substructures.
* Add support for converting `StructuredTensor` to prensor.
Bug Fixes and Other Changes
* Depends on `tensorflow>=2.3.0,<2.4`
* Depends on `tensorflow-metadata>=0.23,<0.24`
Breaking Changes
* Drop snappy support for parquet dataset.
Deprecations
* Deprecating Py2 support.