docs: remove preview notes
remove preview mentions now that Python is GA
### [Click here to find out what's new with Bot Framework](https://github.com/Microsoft/botframework/blob/master/whats-new.md#whats-new)
-# Bot Framework SDK v4 for Python (Preview)
+# Bot Framework SDK v4 for Python
[![Build status](https://fuselabs.visualstudio.com/SDK_v4/_apis/build/status/Python/SDK_v4-Python-CI)](https://fuselabs.visualstudio.com/SDK_v4/_build/latest?definitionId=431)
[![roadmap badge](https://img.shields.io/badge/visit%20the-roadmap-blue.svg)](https://github.com/Microsoft/botbuilder-python/wiki/Roadmap)
[![Coverage Status](https://coveralls.io/repos/github/microsoft/botbuilder-python/badge.svg?branch=HEAD)](https://coveralls.io/github/microsoft/botbuilder-python?branch=HEAD)
[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
-This repository contains code for the Python version of the [Microsoft Bot Framework SDK](https://github.com/Microsoft/botbuilder). The Bot Framework SDK v4 enables developers to model conversation and build sophisticated bot applications using Python. This Python version is in **Preview** state and is being actively developed.
+This repository contains code for the Python version of the [Microsoft Bot Framework SDK](https://github.com/Microsoft/botbuilder). The Bot Framework SDK v4 enables developers to model conversation and build sophisticated bot applications using Python. This Python version is GA and ready for production usage.
This repo is part the [Microsoft Bot Framework](https://github.com/Microsoft/botframework) - a comprehensive framework for building enterprise-grade conversational AI experiences.
