Update build status svg and link to github actions

README.md

@@ -35,7 +35,7 @@ To get up and running quickly, or as an alternative to running your own `step-ca
 
 [![GitHub release](https://img.shields.io/github/release/smallstep/certificates.svg)](https://github.com/smallstep/certificates/releases/latest)
 [![Go Report Card](https://goreportcard.com/badge/github.com/smallstep/certificates)](https://goreportcard.com/report/github.com/smallstep/certificates)
-[![Build Status](https://travis-ci.com/smallstep/certificates.svg?branch=master)](https://travis-ci.com/smallstep/certificates)
+[![Build Status](https://github.com/smallstep/certificates/actions/workflows/test.yml/badge.svg)](https://github.com/smallstep/certificates)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![CLA assistant](https://cla-assistant.io/readme/badge/smallstep/certificates)](https://cla-assistant.io/smallstep/certificates)