chore: release 1.5.0

[release-please]

🤖 I have created a release *beep* *boop*

1.5.0 (2020-05-04)

Features

• add methods for listing snapshots (via synth) (#66) (4ce898e)
• send client id with StreamingPullRequest (#58) (9f8acfa), closes #62

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This PR was generated with Release Please.

[pradn]

Unfortunately this commit isn't showing up here because I forgot to follow conventional commits for this change. It's a pretty minor comment change so it's okay.

a6b4c44

[plamut]

Looks good.

@pradn The missing commit is OK, since it does not affect much. I am wary of releasing on Friday, though, thus if there is no rush, I would wait until Monday, and we can also sneak in the missing commit by then.

[plamut]

@pradn Do you plan to add that minor change, or just make the release as-is?

If the latter, feel free to just merge the PR.

Update: No releases this week, we need to wait then.

[plamut]

@pradn What's the status of this, releasing as-is or adding that previously-forgotten change, too?

[pradn]

I don't think it's worth the time to fix the minor issue. Gonna push the release button.

[yoshi-automation]

Release is at https://github.com/googleapis/python-pubsub/releases/tag/v1.5.0

[pradn]

I updated the release notes:
https://github.com/googleapis/python-pubsub/releases/tag/v1.5.0