chore: release 3.10.0 (#567)

🤖 I have created a release \*beep\* \*boop\*
---
## [3.10.0](https://www.github.com/googleapis/python-spanner/compare/v3.9.0...v3.10.0) (2021-09-17)


### Features

* set a separate user agent for the DB API ([#566](https://www.github.com/googleapis/python-spanner/issues/566)) ([b5f977e](https://www.github.com/googleapis/python-spanner/commit/b5f977ebf61527914af3c8356aeeae9418114215))


### Bug Fixes

* **db_api:** move connection validation into a separate method ([#543](https://www.github.com/googleapis/python-spanner/issues/543)) ([237ae41](https://www.github.com/googleapis/python-spanner/commit/237ae41d0c0db61f157755cf04f84ef2d146972c))
* handle google.api_core.exceptions.OutOfRange exception and throw InegrityError as expected by dbapi standards ([#571](https://www.github.com/googleapis/python-spanner/issues/571)) ([dffcf13](https://www.github.com/googleapis/python-spanner/commit/dffcf13d10a0cfb6b61231ae907367563f8eed87))
---


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

@@ -4,6 +4,19 @@
 
 [1]: https://pypi.org/project/google-cloud-spanner/#history
 
+## [3.10.0](https://www.github.com/googleapis/python-spanner/compare/v3.9.0...v3.10.0) (2021-09-17)
+
+
+### Features
+
+* set a separate user agent for the DB API ([#566](https://www.github.com/googleapis/python-spanner/issues/566)) ([b5f977e](https://www.github.com/googleapis/python-spanner/commit/b5f977ebf61527914af3c8356aeeae9418114215))
+
+
+### Bug Fixes
+
+* **db_api:** move connection validation into a separate method ([#543](https://www.github.com/googleapis/python-spanner/issues/543)) ([237ae41](https://www.github.com/googleapis/python-spanner/commit/237ae41d0c0db61f157755cf04f84ef2d146972c))
+* handle google.api_core.exceptions.OutOfRange exception and throw InegrityError as expected by dbapi standards ([#571](https://www.github.com/googleapis/python-spanner/issues/571)) ([dffcf13](https://www.github.com/googleapis/python-spanner/commit/dffcf13d10a0cfb6b61231ae907367563f8eed87))
+
 ## [3.9.0](https://www.github.com/googleapis/python-spanner/compare/v3.8.0...v3.9.0) (2021-08-26)
 
 

setup.py

@@ -22,7 +22,7 @@
 
 name = "google-cloud-spanner"
 description = "Cloud Spanner API client library"
-version = "3.9.0"
+version = "3.10.0"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'