Update README.md

Author: lemire

README.md

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 # SwiftRoaring
 <a href="https://developer.apple.com/swift"><img src="https://img.shields.io/badge/Swift4-compatible-green.svg?style=flat" alt="Swift 4 compatible" /></a>
 <a href="https://github.com/apple/swift-package-manager"><img src="https://img.shields.io/badge/Swift%20Package%20Manager-compatible-brightgreen.svg"/></a>
-[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
-[![Build Status](https://travis-ci.org/RoaringBitmap/SwiftRoaring.svg?branch=master)](https://travis-ci.org/RoaringBitmap/SwiftRoaring)        
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage) ![Ubuntu  CI](https://github.com/RoaringBitmap/SwiftRoaring/workflows/Swift%20on%20Ubuntu%20(latest)/badge.svg)
+