chore(main): release 1.6.0 (#170)

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

Author: release-please[bot]

CHANGELOG.md

@@ -1,4 +1,22 @@
 # Changelog
+## [1.6.0](https://github.com/googleapis/python-billingbudgets/compare/v1.5.1...v1.6.0) (2022-02-11)
+
+
+### Features
+
+* add api key support ([#169](https://github.com/googleapis/python-billingbudgets/issues/169)) ([93a52a9](https://github.com/googleapis/python-billingbudgets/commit/93a52a9060968a95956f9ec5b7cd7a2ed0fcfce7))
+
+
+### Bug Fixes
+
+* resolve DuplicateCredentialArgs error when using credentials_file ([be9f15e](https://github.com/googleapis/python-billingbudgets/commit/be9f15e147328f0e4dae4ebed94d8585fcb9097b))
+
+
+### Documentation
+
+* add autogenerated code snippets ([5e02634](https://github.com/googleapis/python-billingbudgets/commit/5e026345b1cb9cc77359d7efd98a07ce498a7e74))
+* Formatting change from HTML to markdown; Additional clarifications ([#174](https://github.com/googleapis/python-billingbudgets/issues/174)) ([eaa109d](https://github.com/googleapis/python-billingbudgets/commit/eaa109d24a6af7ad014e8c5606c88c7432f022ff))
+
 ### [1.5.1](https://www.github.com/googleapis/python-billingbudgets/compare/v1.5.0...v1.5.1) (2021-11-01)
 
 

setup.py

@@ -22,7 +22,7 @@
 
 name = "google-cloud-billing-budgets"
 description = "Cloud Billing Budget API API client library"
-version = "1.5.1"
+version = "1.6.0"
 release_status = "Development Status :: 5 - Production/Stable"
 dependencies = [
     # NOTE: Maintainers, please do not require google-api-core>=2.x.x