README: update continuous integration badges

The CI now uses GitHub Actions to run tests and the SELinux testsuite in
a virtual machine. Replace the Travis CI badge with the ones for these
workflows.

Fixes: #299
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
Acked-by: Ondrej Mosnacek <omosnace@redhat.com>

README.md

@@ -2,7 +2,8 @@ SELinux Userspace
 =================
 
 ![SELinux logo](https://github.com/SELinuxProject.png)
-[![Build Status](https://travis-ci.org/SELinuxProject/selinux.svg?branch=master)](https://travis-ci.org/SELinuxProject/selinux)
+[![Run Tests](https://github.com/SELinuxProject/selinux/actions/workflows/run_tests.yml/badge.svg)](https://github.com/SELinuxProject/selinux/actions/workflows/run_tests.yml)
+[![Run SELinux testsuite in a virtual machine](https://github.com/SELinuxProject/selinux/actions/workflows/vm_testsuite.yml/badge.svg)](https://github.com/SELinuxProject/selinux/actions/workflows/vm_testsuite.yml)
 [![OSS-Fuzz Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/selinux.svg)](https://oss-fuzz-build-logs.storage.googleapis.com/index.html#selinux)
 [![CIFuzz Status](https://github.com/SELinuxProject/selinux/actions/workflows/cifuzz.yml/badge.svg)](https://github.com/SELinuxProject/selinux/actions/workflows/cifuzz.yml)