doc: Replace CI badges with GitHub Action status
diff --git a/README.md b/README.md
index f770c1c..a8cb4be 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,4 @@
-[![Build Status](https://travis-ci.org/gflags/gflags.svg?branch=master)](https://travis-ci.org/gflags/gflags)
-[![Build status](https://ci.appveyor.com/api/projects/status/4ctod566ysraus74/branch/master?svg=true)](https://ci.appveyor.com/project/schuhschuh/gflags/branch/master)
+[![tests](https://github.com/gflags/gflags/actions/workflows/test.yml/badge.svg)](https://github.com/gflags/gflags/actions/workflows/test.yml)
 
 The documentation of the gflags library is available online at https://gflags.github.io/gflags/.