Update README to include Raspberry Pi 5 support (#725)

Now that Raspberry Pi 5 is supported by the upstream kernel, let's update the README :)

Author: damdo

README.md

@@ -1,7 +1,7 @@
 # gokrazy kernel: upstream Linux for the Raspberry Pi
 
 This repository holds a pre-built Linux kernel image for the Raspberry Pi 3, Pi
-4, and Pi Zero 2 W, used by the [gokrazy](https://gokrazy.org/) project.
+4, Pi 5, and Pi Zero 2 W, used by the [gokrazy](https://gokrazy.org/) project.
 
 The files in this repository are picked up automatically by
 the `gok` tool, so you don’t need to interact with this repository
@@ -12,7 +12,7 @@ unless you want to update the kernel to a custom version.
 | repository             | source         | devices                       |
 |------------------------|----------------|-------------------------------|
 | [gokrazy/kernel.rpi]   | [Raspberry Pi] | Pi 3, Pi 4, Pi 5, Pi Zero 2 W |
-| [gokrazy/kernel]       | [kernel.org]   | Pi 3, Pi 4, Pi Zero 2 W       |
+| [gokrazy/kernel]       | [kernel.org]   | Pi 3, Pi 4, Pi 5, Pi Zero 2 W |
 | [gokrazy/kernel.amd64] | [kernel.org]   | PC x86_64, VMs                |
 | [gokrazy/kernel.arm64] | [kernel.org]   | PC arm64, VMs                 |