include badge for test output in readme

README.md

@@ -1,10 +1,7 @@
 [![PyPI version](https://badge.fury.io/py/ewstools.svg)](https://badge.fury.io/py/ewstools)
 [![Downloads](https://pepy.tech/badge/ewstools)](https://pepy.tech/project/ewstools)
-[![Build Status](https://travis-ci.com/ThomasMBury/ewstools.svg?branch=master)](https://travis-ci.com/ThomasMBury/ewstools)
+[![tests](https://github.com/ThomasMBury/ewstools/actions/workflows/tests.yml/badge.svg?branch=main)](https://github.com/ThomasMBury/ewstools/actions/workflows/tests.yml)
 [![Documentation Status](https://readthedocs.org/projects/ewstools/badge/?version=latest)](https://ewstools.readthedocs.io/en/latest/?badge=latest)
-[![Coverage Status](https://coveralls.io/repos/github/ThomasMBury/ewstools/badge.svg?branch=master&service=github)](https://coveralls.io/github/ThomasMBury/ewstools?branch=master&service=github)
-[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3497512.svg)](https://doi.org/10.5281/zenodo.3497512)
-
 
 # ewstools
 **A python package for early warning signals (EWS) of bifurcations in time series data.**