chore: release 1.18.0 (#539)

* updated CHANGELOG.md [ci skip]

* updated setup.cfg [ci skip]

* updated setup.py

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf5e6e5..18df080 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,18 @@
 
 [1]: https://pypi.org/project/google-auth/#history
 
+## [1.18.0](https://www.github.com/googleapis/google-auth-library-python/compare/v1.17.2...v1.18.0) (2020-06-18)
+
+
+### Features
+
+* make ``load_credentials_from_file`` a public method ([#530](https://www.github.com/googleapis/google-auth-library-python/issues/530)) ([15d5fa9](https://www.github.com/googleapis/google-auth-library-python/commit/15d5fa946177581b52a5a9eb3ca285c088f5c45d))
+
+
+### Bug Fixes
+
+* no warning if quota_project_id is given ([#537](https://www.github.com/googleapis/google-auth-library-python/issues/537)) ([f30b45a](https://www.github.com/googleapis/google-auth-library-python/commit/f30b45a9b2f824c494724548732c5ce838218c30))
+
 ### [1.17.2](https://www.github.com/googleapis/google-auth-library-python/compare/v1.17.1...v1.17.2) (2020-06-12)
 
 
diff --git a/setup.py b/setup.py
index 22ac79c..6c68a75 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
 with io.open("README.rst", "r") as fh:
     long_description = fh.read()
 
-version = "1.17.2"
+version = "1.18.0"
 
 setup(
     name="google-auth",