Update README for Travis CI inclusion removal.

Author: geerlingguy

README.md

@@ -168,7 +168,7 @@ It's my hope that I can get the rest of these things wrapped up into Ansible pla
 
 Many people have asked me if I often wipe my entire workstation and start from scratch just to test changes to the playbook. Nope! Instead, I posted instructions for how I build a [Mac OS X VirtualBox VM](https://github.com/geerlingguy/mac-osx-virtualbox-vm), on which I can continually run and re-run this playbook to test changes and make sure things work correctly.
 
-Additionally, this project is [continuously tested on Travis CI's macOS infrastructure](https://travis-ci.org/geerlingguy/mac-dev-playbook).
+Additionally, this project is [continuously tested on GitHub Actions' macOS infrastructure](https://github.com/geerlingguy/mac-dev-playbook/actions?query=workflow%3ACI).
 
 ## Ansible for DevOps