chore: release 1.9.0 (#925)

🤖 I have created a release \*beep\* \*boop\* 
---
## [1.9.0](https://www.github.com/googleapis/google-api-python-client/compare/v1.8.4...v1.9.0) (2020-06-02)


### Features

* add mtls feature ([#917](https://www.github.com/googleapis/google-api-python-client/issues/917)) ([981eadf](https://www.github.com/googleapis/google-api-python-client/commit/981eadf7cfdb576981d92fcda498c76422821426))
* add templates for python samples projects ([#506](https://www.github.com/googleapis/google-api-python-client/issues/506)) ([#924](https://www.github.com/googleapis/google-api-python-client/issues/924)) ([c482712](https://www.github.com/googleapis/google-api-python-client/commit/c482712935d1c1331e33bd7f9968bd3b2be223bb))
---


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

Author: release-please[bot]

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## [1.9.0](https://www.github.com/googleapis/google-api-python-client/compare/v1.8.4...v1.9.0) (2020-06-02)
+
+
+### Features
+
+* add mtls feature ([#917](https://www.github.com/googleapis/google-api-python-client/issues/917)) ([981eadf](https://www.github.com/googleapis/google-api-python-client/commit/981eadf7cfdb576981d92fcda498c76422821426))
+* add templates for python samples projects ([#506](https://www.github.com/googleapis/google-api-python-client/issues/506)) ([#924](https://www.github.com/googleapis/google-api-python-client/issues/924)) ([c482712](https://www.github.com/googleapis/google-api-python-client/commit/c482712935d1c1331e33bd7f9968bd3b2be223bb))
+
 ### [1.8.4](https://www.github.com/googleapis/google-api-python-client/compare/v1.8.3...v1.8.4) (2020-05-20)
 
 

setup.py

@@ -52,7 +52,7 @@
 with io.open(readme_filename, encoding="utf-8") as readme_file:
     readme = readme_file.read()
 
-version = "1.8.4"
+version = "1.9.0"
 
 setup(
     name="google-api-python-client",