replace ci button

README.md

@@ -1,2 +1,2 @@
-# ekg-core [![Hackage version](https://img.shields.io/hackage/v/ekg-core.svg?label=Hackage)](https://hackage.haskell.org/package/ekg-core) [![Build Status](https://secure.travis-ci.org/tibbe/ekg-core.svg?branch=master)](http://travis-ci.org/tibbe/ekg-core)
+# ekg-core [![Hackage version](https://img.shields.io/hackage/v/ekg-core.svg?label=Hackage)](https://hackage.haskell.org/package/ekg-core) [![Build Status](https://github.com/haskell-github-trust/ekg-core/actions/workflows/haskell-ci.yml/badge.svg)](https://github.com/haskell-github-trust/ekg-core/actions/workflows/haskell-ci.yml)
 Library for tracking system metrics