v0.3.0

Implementation Changes

• Pick up enum fixes in the GAPIC generator. (#6608)
• Pick up fixes in GAPIC generator. (#6491)
• Fix client_info bug, update docstrings. (#6405)
• Re-generate library using bigquery_datatransfer/synth.py (#5973)
• Fix stray, lint-breaking blank lines from autosynth. (#5960)
• Re-generate library using bigquery_datatransfer/synth.py. (#5947)

Dependencies

• Bump minimum api_core version for all GAPIC libs to 1.4.1. (#6391)

Documentation

• Document Python 2 deprecation (#6910)
• Fix GAX fossils (#6264)
• Normalize use of support level badges (#6159)
• Harmonize / DRY 'README.rst' / 'docs/index.rst'. (#6013)

Internal / Testing Changes

• Update noxfile.
• Blacken all gen'd libs (#6792)
• Omit local deps (#6701)
• Run black at end of synth.py (#6698)
• Unblack bigquery gapic and protos.
• Run Black on Generated libraries (#6666)
• Add templates for flake8, coveragerc, noxfile, and black. (#6642)
• Add synth metadata. (#6562)
• Use new Nox (#6175)