Release 0.16.0

Major Features

Added support for stream timeout in KafkaGroupIODataset
Renamed gstpufs to gsmemcachedfs
Added experimental KakfaBatchIODataset for online learning
Added gabor/laplacian/gaussian filter support
Added basic Arrow string type support for BigQuery reader
Added ElasticSearch dataset support
Added Prewitt and Sobel filter support
Added arbitary dimensional support for decode_json
Added bool data type support for decode_json
Added tutorials for Kafka and ElasticSearch usage with tf.keras.
Containers of tensorflow-io releases are available
at docker pull tfsigio/tfio.

This release contains contributions from many people:

Aleksey Vlasenko, Daniel, Kota Yamaguchi, Mark Daoust,
Michael Kuchnik, Vignesh Kothapalli, Yong Tang, Yuan Tang,
emkornfield, marioecd

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