Features

• Load DataFrame with to_gbq to a table in a project different from
  the API client project. Specify the target table ID as
  project.dataset.table to use this feature. (#321, #347)
• Allow billing project to be separate from destination table project
  in to_gbq. (#321)

Bug fixes

• Avoid 403 error from to_gbq when table has policyTags. (#354)
• Avoid client.dataset deprecation warnings. (#312)

Dependencies

• Drop support for Python 3.5 and 3.6. (#337)
• Drop support for google-cloud-bigquery==2.4.* due to query
  hanging bug. (#343)