Replace Travis badge in README with GHA one

README.md

@@ -5,7 +5,7 @@
 [![Documentation](https://img.shields.io/badge/docs-dev-blue.svg)](https://hsu-ant.github.io/ACME.jl/dev/)
 [![DOI](https://zenodo.org/badge/48224425.svg)](https://zenodo.org/badge/latestdoi/48224425)
 
-[![Build Status](https://travis-ci.org/HSU-ANT/ACME.jl.svg?branch=develop)](https://travis-ci.org/HSU-ANT/ACME.jl)
+[![CI](https://github.com/HSU-ANT/ACME.jl/workflows/CI/badge.svg)](https://github.com/HSU-ANT/ACME.jl/actions?query=workflow%3ACI+branch%3Adevelop)
 [![codecov](https://codecov.io/gh/HSU-ANT/ACME.jl/branch/develop/graph/badge.svg)](https://codecov.io/gh/HSU-ANT/ACME.jl)
 [![Coverage Status](https://coveralls.io/repos/github/HSU-ANT/ACME.jl/badge.svg?branch=develop)](https://coveralls.io/github/HSU-ANT/ACME.jl)