v0.29.1

Notable Implementation Changes

• Bug fix (#4234): Adding retries for connection UNAVAILABLE. This
  bug made the Pub / Sub client mostly unusable for subscribers to topics
  that don't have a steady stream of messages. After ~2 minutes of inactivity,
  the gRPC connection would timeout and raise UNAVAILABLE locally, i.e. not
  due to a response from the backend. (#4444)
• Updating autogenerated packages (#4438)

Documentation

• Fixing broken examples in quick start (#4398)
• Fixing broken example in README (#4402, h/t to @mehmetboraezer)
• Updating old/dead link to usage doc in README (#4406, h/t to @mehmetboraezer)

Dependencies

• Dropping dependency on google-cloud-core in exchange for
  google-api-core (#4438)

PyPI: https://pypi.org/project/google-cloud-pubsub/0.29.1/