Add stage release link and remove versions section.

README.rst

@@ -70,6 +70,8 @@ This client supports the following Google Cloud Platform services at an Alpha_ q
 If you need support for other Google APIs, check out the
 `Google APIs Python Client library`_.
 
+.. _Alpha: https://cloud.google.com/terms/launch-stages
+.. _Beta: https://cloud.google.com/terms/launch-stages
 .. _Google APIs Python Client library: https://github.com/google/google-api-python-client
 
 Quick Start
@@ -100,21 +102,6 @@ You may also find the `authentication document`_ shared by all the
 .. _Authentication section: https://google-cloud-python.readthedocs.io/en/latest/google-cloud-auth.html
 .. _authentication document: https://github.com/GoogleCloudPlatform/gcloud-common/tree/master/authentication
 
-.. _Alpha: #versioning
-.. _Beta: #versioning
-
-Versioning
-----------
-
-This library follows `Semantic Versioning`_.
-
-Please note it is currently under active development. Any release versioned 0.x.y is subject to backwards incompatible changes at any time.
-
-**Beta**: Libraries defined at a Beta quality level are expected to be mostly stable and we're working towards their release candidate. We will address issues and requests with a higher priority.
-
-**Alpha**: Libraries defined at an Alpha quality level are still a work-in-progress and are more likely to get backwards-incompatible updates.
-
-.. _Semantic Versioning: http://semver.org
 
 Contributing
 ------------