v0.3.0-beta3

Changes since v0.3.0-beta2

• Fix BigtableIO #497
• Support BigQuery table description #491
• JIterable serialization improvement #507
• Bump Avro to 1.8.1 #510
• Package object clean up #508
• Add logging for BigtableUtil#updateNumberOfBigtableNodes #498

List of breaking changes:

• https://github.com/spotify/scio/wiki/Apache-Beam

Known issues:

• Scala 2.12 build is not available pending some compiler bugs (SI-10232, SI-10233)
• NPE in DirectRunner (including local scio-repl) in streaming mode BEAM-1835