chore: release 2.8.0 (#491)

🤖 I have created a release \*beep\* \*boop\*
---
## [2.8.0](https://www.github.com/googleapis/python-pubsub/compare/v2.7.1...v2.8.0) (2021-09-02)


### Features

* closed subscriber as context manager raises ([#488](https://www.github.com/googleapis/python-pubsub/issues/488)) ([a05a3f2](https://www.github.com/googleapis/python-pubsub/commit/a05a3f250cf8567ffe0d2eb3ecc45856a2bcd07c))


### Documentation

* clarify the types of Message parameters ([#486](https://www.github.com/googleapis/python-pubsub/issues/486)) ([633e91b](https://www.github.com/googleapis/python-pubsub/commit/633e91bbfc0a8f4f484089acff6812b754f40c75))
---


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

CHANGELOG.md

@@ -5,6 +5,18 @@
 [1]: https://pypi.org/project/google-cloud-pubsub/#history
 
 
+## [2.8.0](https://www.github.com/googleapis/python-pubsub/compare/v2.7.1...v2.8.0) (2021-09-02)
+
+
+### Features
+
+* closed subscriber as context manager raises ([#488](https://www.github.com/googleapis/python-pubsub/issues/488)) ([a05a3f2](https://www.github.com/googleapis/python-pubsub/commit/a05a3f250cf8567ffe0d2eb3ecc45856a2bcd07c))
+
+
+### Documentation
+
+* clarify the types of Message parameters ([#486](https://www.github.com/googleapis/python-pubsub/issues/486)) ([633e91b](https://www.github.com/googleapis/python-pubsub/commit/633e91bbfc0a8f4f484089acff6812b754f40c75))
+
 ### [2.7.1](https://www.github.com/googleapis/python-pubsub/compare/v2.7.0...v2.7.1) (2021-08-13)
 
 

setup.py

@@ -22,7 +22,7 @@
 
 name = "google-cloud-pubsub"
 description = "Google Cloud Pub/Sub API client library"
-version = "2.7.1"
+version = "2.8.0"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'