feat: bump release level to production/stable (#39)

Fixes #38 🦕

.repo-metadata.json

@@ -4,7 +4,7 @@
     "product_documentation": "https://cloud.google.com/retail/docs/",
     "client_documentation": "https://googleapis.dev/python/retail/latest",
     "issue_tracker": "",
-    "release_level": "beta",
+    "release_level": "ga",
     "language": "python",
     "library_type": "GAPIC_AUTO",
     "repo": "googleapis/python-retail",

README.rst

@@ -1,7 +1,7 @@
 Python Client for Retail API
 =================================================
 
-|beta| |pypi| |versions|
+|GA| |pypi| |versions|
 
 `Retail API`_: Cloud Retail service enables customers to build end-to-end personalized
 recommendation systems without requiring a high level of expertise in
@@ -10,8 +10,8 @@ machine learning, recommendation system, or Google Cloud.
 - `Client Library Documentation`_
 - `Product Documentation`_
 
-.. |beta| image:: https://img.shields.io/badge/support-beta-orange.svg
-   :target: https://github.com/googleapis/google-cloud-python/blob/master/README.rst#beta-support
+.. |GA| image:: https://img.shields.io/badge/support-ga-gold.svg
+   :target: https://github.com/googleapis/google-cloud-python/blob/master/README.rst#general-availability
 .. |pypi| image:: https://img.shields.io/pypi/v/google-cloud-retail.svg
    :target: https://pypi.org/project/google-cloud-retail/
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-retail.svg

setup.py

@@ -47,7 +47,7 @@
     python_requires=">=3.6",
     scripts=["scripts/fixup_retail_v2_keywords.py",],
     classifiers=[
-        "Development Status :: 3 - Alpha",
+        "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "Operating System :: OS Independent",
         "Programming Language :: Python :: 3.6",