chore: release 3.9.0 (#540)

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

Author: release-please[bot]

CHANGELOG.md

@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/google-cloud-spanner/#history
 
+## [3.9.0](https://www.github.com/googleapis/python-spanner/compare/v3.8.0...v3.9.0) (2021-08-26)
+
+
+### Features
+
+* add support for JSON type ([#353](https://www.github.com/googleapis/python-spanner/issues/353)) ([b1dd04d](https://www.github.com/googleapis/python-spanner/commit/b1dd04d89df6339a9624378c31f9ab26a6114a54))
+
 ## [3.8.0](https://www.github.com/googleapis/python-spanner/compare/v3.7.0...v3.8.0) (2021-08-15)
 
 

setup.py

@@ -22,7 +22,7 @@
 
 name = "google-cloud-spanner"
 description = "Cloud Spanner API client library"
-version = "3.8.0"
+version = "3.9.0"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'