chore: release 2.6.0 (#236)

🤖 I have created a release \*beep\* \*boop\*
---
## [2.6.0](https://www.github.com/googleapis/python-monitoring/compare/v2.5.2...v2.6.0) (2021-11-01)


### Features

* add context manager support in client ([#230](https://www.github.com/googleapis/python-monitoring/issues/230)) ([954dd18](https://www.github.com/googleapis/python-monitoring/commit/954dd18966520dbc623470ef528166d83d3e19ba))
* add CreateServiceTimeSeries RPC ([#235](https://www.github.com/googleapis/python-monitoring/issues/235)) ([2970b22](https://www.github.com/googleapis/python-monitoring/commit/2970b22ca5b4959ee1d3e1e883cdb00951e3917f))


### Bug Fixes

* **deps:** drop packaging dependency ([22d4eab](https://www.github.com/googleapis/python-monitoring/commit/22d4eabbafbdc16b0f4faf66f966442691de7666))
* **deps:** require google-api-core >= 1.28.0 ([22d4eab](https://www.github.com/googleapis/python-monitoring/commit/22d4eabbafbdc16b0f4faf66f966442691de7666))
* Reintroduce deprecated field/enum `ServiceTier` for backward compatibility ([#240](https://www.github.com/googleapis/python-monitoring/issues/240)) ([eeb0534](https://www.github.com/googleapis/python-monitoring/commit/eeb05347eaf6e7a0794e679d83fe70a0db6a02a3))


### Documentation

* list oneofs in docstring ([22d4eab](https://www.github.com/googleapis/python-monitoring/commit/22d4eabbafbdc16b0f4faf66f966442691de7666))
* Use absolute link targets in comments ([eeb0534](https://www.github.com/googleapis/python-monitoring/commit/eeb05347eaf6e7a0794e679d83fe70a0db6a02a3))
---


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 +4,27 @@
 
 [1]: https://pypi.org/project/google-cloud-monitoring/#history
 
+## [2.6.0](https://www.github.com/googleapis/python-monitoring/compare/v2.5.2...v2.6.0) (2021-11-01)
+
+
+### Features
+
+* add context manager support in client ([#230](https://www.github.com/googleapis/python-monitoring/issues/230)) ([954dd18](https://www.github.com/googleapis/python-monitoring/commit/954dd18966520dbc623470ef528166d83d3e19ba))
+* add CreateServiceTimeSeries RPC ([#235](https://www.github.com/googleapis/python-monitoring/issues/235)) ([2970b22](https://www.github.com/googleapis/python-monitoring/commit/2970b22ca5b4959ee1d3e1e883cdb00951e3917f))
+
+
+### Bug Fixes
+
+* **deps:** drop packaging dependency ([22d4eab](https://www.github.com/googleapis/python-monitoring/commit/22d4eabbafbdc16b0f4faf66f966442691de7666))
+* **deps:** require google-api-core >= 1.28.0 ([22d4eab](https://www.github.com/googleapis/python-monitoring/commit/22d4eabbafbdc16b0f4faf66f966442691de7666))
+* Reintroduce deprecated field/enum `ServiceTier` for backward compatibility ([#240](https://www.github.com/googleapis/python-monitoring/issues/240)) ([eeb0534](https://www.github.com/googleapis/python-monitoring/commit/eeb05347eaf6e7a0794e679d83fe70a0db6a02a3))
+
+
+### Documentation
+
+* list oneofs in docstring ([22d4eab](https://www.github.com/googleapis/python-monitoring/commit/22d4eabbafbdc16b0f4faf66f966442691de7666))
+* Use absolute link targets in comments ([eeb0534](https://www.github.com/googleapis/python-monitoring/commit/eeb05347eaf6e7a0794e679d83fe70a0db6a02a3))
+
 ## [2.6.0](https://www.github.com/googleapis/python-monitoring/compare/v2.5.2...v2.6.0) (2021-10-07)