feat: switch development status to beta (GoogleCloudPlatform#149)

README.md

@@ -1,5 +1,5 @@
 # Cloud SQL Connector for Python Drivers
-**Warning**: This project is currently in _alpha_, and releases may contain breaking API changes.
+**Warning**: This project is currently in _beta_. Please [open an issue](https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/new/choose) if you would like to report a bug or documentation issue, request a feature, or have a question.
 
 The Cloud SQL Python Connector is a library that can be used alongside a database driver to allow users with sufficient permissions to connect to a Cloud SQL
 database without having to manually allowlist IPs or manage SSL certificates.

setup.py

@@ -41,7 +41,7 @@
     exec(fp.read(), version)
 version = version["__version__"]
 
-release_status = "Development Status :: 3 - Alpha"
+release_status = "Development Status :: 4 - Beta"
 core_dependencies = [
     "aiohttp",
     "cryptography",
@@ -63,12 +63,14 @@
     classifiers=[
         release_status,
         "Intended Audience :: Developers",
-        "Development Status :: 3 - Alpha",
+        "Development Status :: 4 - Beta",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
     ],
     platforms="Posix; MacOS X; Windows",
     packages=packages,