chore: release 2.7.1 (googleapis#473)

🤖 I have created a release \*beep\* \*boop\*
---
### [2.7.1](https://www.github.com/googleapis/python-pubsub/compare/v2.7.0...v2.7.1) (2021-08-13)


### Bug Fixes

* remove dependency on pytz ([googleapis#472](https://www.github.com/googleapis/python-pubsub/issues/472)) ([972cc16](https://www.github.com/googleapis/python-pubsub/commit/972cc163f5a1477b37a5ab7e329faf1468637fa2))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

chore: release 2.7.0 (googleapis#452)

* chore: release 2.7.0

* Groom release notes

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Peter Lamut <plamut@users.noreply.github.com>

chore: release v2.6.1 (googleapis#437)

chore: release 2.6.0 (googleapis#428)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

chore: release 2.5.0 (googleapis#412)

🤖 I have created a release \*beep\* \*boop\*
---
## [2.5.0](https://www.github.com/googleapis/python-pubsub/compare/v2.4.2...v2.5.0) (2021-05-18)


### Features

* make publish futures compatible with concurrent.futures.as_completed() ([googleapis#397](https://www.github.com/googleapis/python-pubsub/issues/397)) ([e29a2c0](https://www.github.com/googleapis/python-pubsub/commit/e29a2c0ac6c5d2ebf2311646e552a02f184cfedc))


### Bug Fixes

* scheduler errors when executor in shutdown ([googleapis#399](https://www.github.com/googleapis/python-pubsub/issues/399)) ([39a83d3](https://www.github.com/googleapis/python-pubsub/commit/39a83d3eef196e88478ad8362201a2ab12e9f681))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

chore: release v2.4.2 (googleapis#409)

chore: release 2.4.1 (googleapis#347)

* chore: release 2.4.1

* Cleanup release notes.

* Update CHANGELOG.md

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

chore: release v2.4.0 (googleapis#296)

chore: release 2.3.0 (googleapis#283)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

chore: release 2.2.0 (googleapis#234)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>