chore: release 3.12.0 (#614)

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

Author: release-please[bot]

CHANGELOG.md

@@ -4,6 +4,38 @@
 
 [1]: https://pypi.org/project/google-cloud-spanner/#history
 
+## [3.12.0](https://www.github.com/googleapis/python-spanner/compare/v3.11.1...v3.12.0) (2021-11-25)
+
+
+### Features
+
+* add context manager support in client ([5ae4be8](https://www.github.com/googleapis/python-spanner/commit/5ae4be8ce0a429b33b31a119d7079ce4deb50ca2))
+* add context manager support in client ([#637](https://www.github.com/googleapis/python-spanner/issues/637)) ([5ae4be8](https://www.github.com/googleapis/python-spanner/commit/5ae4be8ce0a429b33b31a119d7079ce4deb50ca2))
+* add support for python 3.10 ([#626](https://www.github.com/googleapis/python-spanner/issues/626)) ([17ca61b](https://www.github.com/googleapis/python-spanner/commit/17ca61b3a8d3f70c400fb57be5edc9073079b9e4)), closes [#623](https://www.github.com/googleapis/python-spanner/issues/623)
+* **db_api:** add an ability to set ReadOnly/ReadWrite connection mode ([#475](https://www.github.com/googleapis/python-spanner/issues/475)) ([cd3b950](https://www.github.com/googleapis/python-spanner/commit/cd3b950e042cd55d5f4a7234dd79c60d49faa15b))
+* **db_api:** make rowcount property NotImplemented ([#603](https://www.github.com/googleapis/python-spanner/issues/603)) ([b5a567f](https://www.github.com/googleapis/python-spanner/commit/b5a567f1db8762802182a3319c16b6456bb208d8))
+* **db_api:** raise exception with message for executemany() ([#595](https://www.github.com/googleapis/python-spanner/issues/595)) ([95908f6](https://www.github.com/googleapis/python-spanner/commit/95908f67e81554858060f0831d10ff05d149fbba))
+* **db_api:** support JSON data type ([#627](https://www.github.com/googleapis/python-spanner/issues/627)) ([d760c2c](https://www.github.com/googleapis/python-spanner/commit/d760c2c240cc80fadaaba9d3a4a3847e10c3c093))
+* **db_api:** support stale reads ([#584](https://www.github.com/googleapis/python-spanner/issues/584)) ([8ca868c](https://www.github.com/googleapis/python-spanner/commit/8ca868c3b3f487c1ef4f655aedd0ac2ca449c103))
+
+
+### Bug Fixes
+
+* **db_api:** emit warning instead of an exception for `rowcount` property ([#628](https://www.github.com/googleapis/python-spanner/issues/628)) ([62ff9ae](https://www.github.com/googleapis/python-spanner/commit/62ff9ae80a9972b0062aca0e9bb3affafb8ec490))
+* **deps:** drop packaging dependency ([5ae4be8](https://www.github.com/googleapis/python-spanner/commit/5ae4be8ce0a429b33b31a119d7079ce4deb50ca2))
+* **deps:** require google-api-core >= 1.28.0 ([5ae4be8](https://www.github.com/googleapis/python-spanner/commit/5ae4be8ce0a429b33b31a119d7079ce4deb50ca2))
+* improper types in pagers generation ([5ae4be8](https://www.github.com/googleapis/python-spanner/commit/5ae4be8ce0a429b33b31a119d7079ce4deb50ca2))
+
+
+### Performance Improvements
+
+* **dbapi:** set headers correctly for dynamic routing ([#644](https://www.github.com/googleapis/python-spanner/issues/644)) ([d769ff8](https://www.github.com/googleapis/python-spanner/commit/d769ff803c41394c9c175e3de772039d816b9cb5))
+
+
+### Documentation
+
+* list oneofs in docstring ([5ae4be8](https://www.github.com/googleapis/python-spanner/commit/5ae4be8ce0a429b33b31a119d7079ce4deb50ca2))
+
 ### [3.11.1](https://www.github.com/googleapis/python-spanner/compare/v3.11.0...v3.11.1) (2021-10-04)
 
 

setup.py

@@ -22,7 +22,7 @@
 
 name = "google-cloud-spanner"
 description = "Cloud Spanner API client library"
-version = "3.11.1"
+version = "3.12.0"
 # Should be one of:
 # 'Development Status :: 3 - Alpha'
 # 'Development Status :: 4 - Beta'