Update README.md

Author: lemire

README.md

@@ -1,6 +1,6 @@
 SIMDCompressionAndIntersection
 ======================
-[![Build Status](https://travis-ci.org/lemire/SIMDCompressionAndIntersection.png)](https://travis-ci.org/lemire/SIMDCompressionAndIntersection)
+[![Ubuntu 22.04 CI (GCC 11)](https://github.com/lemire/SIMDCompressionAndIntersection/actions/workflows/ubuntu22.yml/badge.svg)](https://github.com/lemire/SIMDCompressionAndIntersection/actions/workflows/ubuntu22.yml)
 [![Code Quality: Cpp](https://img.shields.io/lgtm/grade/cpp/g/lemire/SIMDCompressionAndIntersection.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/lemire/SIMDCompressionAndIntersection/context:cpp)