Update README.md
Add GitHub CI badge
# PyElastica
-[![Build_status](https://travis-ci.com/GazzolaLab/PyElastica.svg?branch=master)](https://travis-ci.com/github/GazzolaLab/PyElastica) [![Documentation Status](https://readthedocs.org/projects/pyelastica/badge/?version=latest)](https://docs.cosseratrods.org/en/latest/?badge=latest) [![codecov](https://codecov.io/gh/GazzolaLab/PyElastica/branch/master/graph/badge.svg)](https://codecov.io/gh/GazzolaLab/PyElastica) [![Downloads](https://pepy.tech/badge/pyelastica)](https://pepy.tech/project/pyelastica) [![](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/GazzolaLab/PyElastica/master?filepath=examples%2FBinder%2F0_PyElastica_Tutorials_Overview.ipynb)
+[![Build_status](https://travis-ci.com/GazzolaLab/PyElastica.svg?branch=master)](https://travis-ci.com/github/GazzolaLab/PyElastica) ![CI](https://github.com/GazzolaLab/PyElastica/workflows/CI/badge.svg) [![Documentation Status](https://readthedocs.org/projects/pyelastica/badge/?version=latest)](https://docs.cosseratrods.org/en/latest/?badge=latest) [![codecov](https://codecov.io/gh/GazzolaLab/PyElastica/branch/master/graph/badge.svg)](https://codecov.io/gh/GazzolaLab/PyElastica) [![Downloads](https://pepy.tech/badge/pyelastica)](https://pepy.tech/project/pyelastica) [![](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/GazzolaLab/PyElastica/master?filepath=examples%2FBinder%2F0_PyElastica_Tutorials_Overview.ipynb)
PyElastica is the python implementation of **Elastica**, which is a *free* and *open-source* software project for the simulation of assemblies of slender, one-dimensional structures using Cosserat Rod theory. More information about Elastica and Cosserat rod theory is available at the Elastica [project website](https://cosseratrods.org)
