Update badges

Author: trygve-lie

README.md

@@ -2,10 +2,10 @@
 
 Generic collector types suitable for aggregating metrics. Implements Histogram, Counter and Gauge.
 
-[![Dependencies](https://img.shields.io/david/metrics-js/collectors.svg?style=flat-square)](https://david-dm.org/metrics-js/collectors)
-[![Build Status](http://img.shields.io/travis/metrics-js/collectors/master.svg?style=flat-square)](https://travis-ci.org/metrics-js/collectors)
-[![Greenkeeper badge](https://badges.greenkeeper.io/metrics-js/collectors.svg?style=flat-square)](https://greenkeeper.io/)
-[![Known Vulnerabilities](https://snyk.io/test/github/metrics-js/collectors/badge.svg?targetFile=package.json&style=flat-square)](https://snyk.io/test/github/metrics-js/collectors?targetFile=package.json)
+[![Dependencies](https://img.shields.io/david/metrics-js/collectors.svg)](https://david-dm.org/metrics-js/collectors)
+[![GitHub Actions status](https://github.com/metrics-js/collectors/workflows/Run%20Lint%20and%20Tests/badge.svg)](https://github.com/metrics-js/collectors/actions?query=workflow%3A%22Run+Lint+and+Tests%22)
+[![Known Vulnerabilities](https://snyk.io/test/github/metrics-js/collectors/badge.svg?targetFile=package.json)](https://snyk.io/test/github/metrics-js/collectors?targetFile=package.json)
+
 
 ## Histogram