Update README.md

Author: WirelessLife

03-Introduction-to-GitHub-Copilot/README.md

@@ -18,7 +18,7 @@ Note: Although this module uses [Codespaces](https://github.com/codespaces), you
 - **Who this is for**: Developers, DevOps Engineers, Software development managers, Testers.
 - **What you'll learn**: How to install Copilot into a Codespace, accept suggestions from code, accept suggestions from comments.
 - **What you'll build**: Javascript files that will have code generated by Copilot AI for code and comment suggestions.
-- **Prerequisites**: To use GitHub Copilot you must have an active GitHub Copilot subscription. Sign up for 30 days free [Copilot](https://github.com/settings/copilot).
+- **Prerequisites**: To use GitHub Copilot you must have an active GitHub Copilot subscription. Sign up for the free tier here: [GitHub Copilot](https://gh.io/copilot)
 - **Timing**: This course can be completed in under an hour.