README: add one more kernel-version line

I want to add as many as possible to show people that each kernel version
has something nice to entice them to keep moving up ;)

diff --git a/README b/README
index 4c9d9ae1bd864ff8bd1b771f42a32f46baea3580..3cc215f1ebd4c7c3f7f73ae6262ad3688b4ecb3a 100644 (file)
--- a/README
+++ b/README
@@ -37,6 +37,7 @@ REQUIREMENTS:
                      ≥ 4.10 for cgroup-bpf egress and ingress hooks
                      ≥ 4.15 for cgroup-bpf device hook and cpu controller in cgroup v2
                      ≥ 4.17 for cgroup-bpf socket address hooks
+                     ≥ 4.20 for PSI (used by systemd-oomd)
                      ≥ 5.3 for bounded loops in BPF program
                      ≥ 5.4 for signed Verity images
                      ≥ 5.7 for BPF links and the BPF LSM hook