Update README.md

Author: sanzmauro

README.md

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 # Split Python SDK 
-[![Build Status](https://api.travis-ci.com/splitio/python-client.svg?branch=master)](https://api.travis-ci.com/splitio/python-client)
+![Build Status](https://github.com/splitio/python-client/actions/workflows/ci.yml/badge.svg?branch=master)
 
 ## Overview
 This SDK is designed to work with Split, the platform for controlled rollouts, which serves features to your users via a Split feature flag to manage your complete customer experience.