Tensorflow-io

Major Features
* S3 and HDFS file system supports fully migrated from tensorflow to tensorflow-io package.
* Add tutorial of MongoDB support with tensorflow-io.
* Add tutorial of ORC support with tensorflow-io
* Add batched string support for Apache Arrow.

Bug Fixes
* Fix decode_video returning only the first frame.
* Reset mongo cursor after reaching end of collection.

Thanks to our Contributors

This release contains contributions from many people:

Aleksey Vlasenko, Gerard Casas Saez, Keqiu Hu, Kota Yamaguchi,
Mark Daoust, Vignesh Kothapalli, Yong Tang, austinzh

We are also grateful to all who filed issues or helped resolve them, asked and
answered questions, and were part of inspiring discussions.

Bug Fixes
* Fixed wheel issue with tensorflow-io-gcs-filesystem by removing temporary build folder.

Thanks to our Contributors

This release contains contributions from many people:

Gerard Casas Saez, Kota Yamaguchi, Vignesh Kothapalli, Vo Van Nghia, Yong Tang, emkornfield

We are also grateful to all who filed issues or helped resolve them, asked and
answered questions, and were part of inspiring discussions.

Major Features
* Add ffmpeg default thread options.
* Set deadline for ReadRows request in BigQuery.
* Allow setting the number of records fetched from kafka in KafkaDataset.

Thanks to our Contributors

This release contains contributions from many people:

Kota Yamaguchi, Vignesh Kothapalli, Vo Van Nghia, Yong Tang, emkornfield

We are also grateful to all who filed issues or helped resolve them, asked and
answered questions, and were part of inspiring discussions.

Major Features
* GCS modular file system is now part of the tensorflow-io-gcs-filesystem package.
* S3 and HDFS modular file systems can be enabled with TF_USE_MODULAR_FILESYSTEM=1.
* Add python 3.9 support on macOS, Linux, and Windows.
* Add initial wavefront/obj parser for 3D vertices.
* Move tfio.experimental.audio to tfio.audio.
* Add https file system registration.
* Add FFmpeg support on macOS.
* Add 16 bit TIFF support.

Thanks to our Contributors

This release contains contributions from many people:

Cheng Ren, Dale Lane, Irene Onyeneho, Keqiu Hu, Kota Yamaguchi,
Mark Daoust, Vignesh Kothapalli, Vo Van Nghia, Yong Tang,
Yuan Tang, markemus

We are also grateful to all who filed issues or helped resolve them, asked and
answered questions, and were part of inspiring discussions.

Bug Fixes
* Fixed incomplete row reading issue in parquet files.

Thanks to our Contributors

This release contains contributions from many people:

Samuel Marks, Tom McTiernan, Vignesh Kothapalli, Yong Tang,
Yunze Xu, 博琰

We are also grateful to all who filed issues or helped resolve them, asked and
answered questions, and were part of inspiring discussions.

Major Features
* Added MongoDB dataset support.
* Added Apache Pulsar dataset support.
* Added FFMpeg support for Ubuntu 20.04.
* Added the message offset to record for Kafka dataset.
* Azure file system migrated to modular file system C APIs.
* HTTP file system migrated to modular file system C APIs.
* Initial s3 modular file system support through scheme `s3e://`.
* Initial gcs modular file system support through scheme `gse://`.
* Initial hdfs modular file system support through scheme `hdfse://`.

Thanks to our Contributors

This release contains contributions from many people:

Samuel Marks, Tom McTiernan, Vignesh Kothapalli, Yong Tang,
Yunze Xu, 博琰

We are also grateful to all who filed issues or helped resolve them, asked and
answered questions, and were part of inspiring discussions.