docs: replaced Travis CI build status with GitHub actions status

Author: CloudyPadmal

README.md

@@ -2,7 +2,7 @@
 
 The Python library for the [Pocket Science Lab](https://pslab.io) from FOSSASIA.
 
-[![Build Status](https://travis-ci.org/fossasia/pslab-python.svg?branch=development)](https://travis-ci.org/fossasia/pslab-python)
+[![Build Status](https://github.com/fossasia/pslab-python/actions/workflows/workflow.yml/badge.svg)](https://github.com/fossasia/pslab-python/actions/workflows/workflow.yml)
 [![Gitter](https://badges.gitter.im/fossasia/pslab.svg)](https://gitter.im/fossasia/pslab?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/ce4af216571846308f66da4b7f26efc7)](https://www.codacy.com/app/mb/pslab-python?utm_source=github.com&utm_medium=referral&utm_content=fossasia/pslab&utm_campaign=Badge_Grade)
 [![Mailing List](https://img.shields.io/badge/Mailing%20List-FOSSASIA-blue.svg)](https://groups.google.com/forum/#!forum/pslab-fossasia)