Update list of supported Ubuntu versions

README.md

@@ -3,9 +3,9 @@
 Systemd Ubuntu Container Images for testing roles with Molecule and Podman.
 Supported Ubuntu versions:
 
+* `24.04`
 * `22.04`
 * `20.04`
-* `18.04`
 
 ## Available Images
 
@@ -15,9 +15,9 @@ GitHub Package Registry.
 These tags are available. They are updated on changes to the `main` branch
 and are automatically rebuilt once a week.
 
+* `ghcr.io/hifis-net/ubuntu-systemd:24.04`
 * `ghcr.io/hifis-net/ubuntu-systemd:22.04`
 * `ghcr.io/hifis-net/ubuntu-systemd:20.04`
-* `ghcr.io/hifis-net/ubuntu-systemd:18.04`
 
 ## How to Use