This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-05-28 05:21:11,710 synthtool [DEBUG] > Executing /home/kbuilder/.cache/synthtool/python-billing/synth.py.
On branch autosynth
nothing to commit, working tree clean
2020-05-28 05:21:11,855 synthtool [DEBUG] > Ensuring dependencies.
2020-05-28 05:21:12,184 synthtool [DEBUG] > Cloning googleapis.
2020-05-28 05:21:12,538 synthtool [DEBUG] > Pulling Docker image: gapic-generator-python:latest
latest: Pulling from gapic-images/gapic-generator-python
Digest: sha256:99070ca71497522095786ca73fc09615b79581e9e0e9cd7f02170124b4337a43
Status: Image is up to date for gcr.io/gapic-images/gapic-generator-python:latest
2020-05-28 05:21:13,481 synthtool [DEBUG] > Generating code for: google/cloud/billing/v1.
2020-05-28 05:21:18,917 synthtool [SUCCESS] > Generated code into /tmpfs/tmp/tmp1vlxxcbw.
2020-05-28 05:21:18,938 synthtool [WARNING] > No replacements made in **/*_pb2.py for pattern (\# -\*- coding: utf-8 -\*-\n)(\# Generated by the protocol buffer compiler\.  DO NOT EDIT!.*?# source: .*?\.proto), maybe replacement is no longer needed?
2020-05-28 05:21:18,941 synthtool [WARNING] > No replacements made in **/*_pb2_grpc.py for pattern (\# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!)
(import grpc), maybe replacement is no longer needed?
.coveragerc
.flake8
.github/CONTRIBUTING.md
.github/ISSUE_TEMPLATE/bug_report.md
.github/ISSUE_TEMPLATE/feature_request.md
.github/ISSUE_TEMPLATE/support_request.md
.github/PULL_REQUEST_TEMPLATE.md
.github/release-please.yml
.gitignore
.kokoro/build.sh
.kokoro/continuous/common.cfg
.kokoro/continuous/continuous.cfg
.kokoro/docs/common.cfg
.kokoro/docs/docs.cfg
.kokoro/presubmit/common.cfg
.kokoro/presubmit/presubmit.cfg
.kokoro/publish-docs.sh
.kokoro/release.sh
.kokoro/release/common.cfg
.kokoro/release/release.cfg
.kokoro/trampoline.sh
CODE_OF_CONDUCT.md
CONTRIBUTING.rst
LICENSE
MANIFEST.in
docs/_static/custom.css
docs/_templates/layout.html
docs/conf.py.j2
docs/multiprocessing.rst
noxfile.py.j2
renovate.json
setup.cfg
2020-05-28 05:21:19,036 synthtool [INFO] > Replaced 'bigquery/docs/generated' in .gitignore.
2020-05-28 05:21:19,037 synthtool [INFO] > Replaced '\\["2\\.7", ' in noxfile.py.
2020-05-28 05:21:19,037 synthtool [INFO] > Replaced '"3.5", ' in noxfile.py.
2020-05-28 05:21:19,038 synthtool [INFO] > Replaced '(ignore = .*)' in .flake8.
Running session blacken
Creating virtual environment (virtualenv) using python3.6 in .nox/blacken
pip install black==19.3b0
black docs google tests noxfile.py setup.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_billing/__init__.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/__init__.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing/__init__.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_billing/transports/__init__.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/docs/conf.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_billing/pagers.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_catalog/__init__.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_billing/transports/base.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_catalog/pagers.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_catalog/transports/__init__.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_catalog/transports/base.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_catalog/client.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_billing/transports/grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/types/__init__.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_catalog/transports/grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/types/cloud_billing.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/noxfile.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/services/cloud_billing/client.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/google/cloud/billing_v1/types/cloud_catalog.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/tests/unit/billing_v1/test_cloud_catalog.py
reformatted /home/kbuilder/.cache/synthtool/python-billing/tests/unit/billing_v1/test_cloud_billing.py
All done! ✨ 🍰 ✨
21 files reformatted, 2 files left unchanged.
Session blacken was successful.
2020-05-28 05:21:23,468 synthtool [DEBUG] > Wrote metadata to synth.metadata.

```
</details>

…tions (#29)

🤖 I have created a release \*beep\* \*boop\* 
---
## [1.1.0](https://www.github.com/googleapis/python-billing/compare/v1.0.0...v1.1.0) (2020-11-17)


### Features

* add async client, support credentials_file and scopes client options ([#29](https://www.github.com/googleapis/python-billing/issues/29)) ([4177eb5](https://www.github.com/googleapis/python-billing/commit/4177eb53544392931a17a6fc8e51b24c69698969))
* add mtls support ([#19](https://www.github.com/googleapis/python-billing/issues/19)) ([fef622a](https://www.github.com/googleapis/python-billing/commit/fef622a0dddf005d8af329ee001ec41f03850427))
---


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