Release bigquery 1.5.0

[tswast]

This pull request was generated using releasetool.

Closes #5726

[tseaver]

@tswast I don't see the bigquery-1.5.0 tag, nor an entry on the release page.

[tseaver]

Note that the PyPI release won't be done by CI without making / pushing the tag.

[tswast]

That's because the test hadn't finished running yet. It just failed. :-( https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/7549

Assigning to @crwilcox to cut the release manually.

[tseaver]

@tswast That CI run was against master (following the merge of this PR). We also need to get a tag made and pushed, which will kick of another CI run for the tag: that one will publish the release to PyPI (if it succeeds). We also need to create a Github release from the tag, and copy over the 1.5.0 changelog to it.

[tswast]

Release is at https://github.com/GoogleCloudPlatform/google-cloud-python/releases/tag/bigquery-1.5.0

[tswast]

Thanks. I forgot to run "releasetool tag". Just tagged.