Update README.md

Author: marcserrat

README.md

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 ![pyversions](https://img.shields.io/pypi/pyversions/connect-sdk.svg)  [![PyPi Status](https://img.shields.io/pypi/v/connect-sdk.svg)](https://pypi.org/project/connect-sdk/) [![codecov](https://codecov.io/gh/cloudblue/connect-python-sdk/branch/master/graph/badge.svg)](https://codecov.io/gh/cloudblue/connect-python-sdk) [![Build Status](https://github.com/cloudblue/connect-python-sdk/workflows/Build%20Connect%20Python%20SDK/badge.svg)](https://github.com/cloudblue/connect-python-sdk/actions) [![PyPI status](https://img.shields.io/pypi/status/connect-sdk.svg)](https://pypi.python.org/pypi/connect-sdk/) [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=connectpythonsdk&metric=alert_status)](https://sonarcloud.io/dashboard?id=connectpythonsdk)
 
+> **_NOTE:_** We strongly recommend to use the [connect-openapi-client](https://github.com/cloudblue/connect-python-openapi-client) with python instead of this SDK. All new functionalities are only added to python openapi client.
+
 Connect Python SDK allows an easy and fast integration with Connect fulfillment API. Thanks to it you can automate the fulfillment of orders generated by your products.
 
 Please check the documentation available [here](https://connect-python-sdk.readthedocs.io), which contains information on how to install and use the library, and a complete API reference guide.