README: mention fsopen() is since kernel v5.2

It is introduced by the following commit.
https://github.com/torvalds/linux/commit/24dcb3d90a1f67fe08c68a004af37df059d74005

diff --git a/README b/README
index e677c2a800718d6ffd35f2872ebed8c829bdaae7..fd418f60fc45998597b13f50c2c5592a799e2e3d 100644 (file)
--- a/README
+++ b/README
@@ -41,7 +41,7 @@ REQUIREMENTS:
                      ≥ 4.15 for cgroup-bpf device hook and cpu controller in cgroup v2
                      ≥ 4.17 for cgroup-bpf socket address hooks and /sys/power/resume_offset
                      ≥ 4.20 for PSI (used by systemd-oomd)
-                     ≥ 5.2 for cgroup freezer
+                     ≥ 5.2 for cgroup freezer, and fsopen()
                      ≥ 5.3 for bounded loops in BPF program and keyring namespacing
                      ≥ 5.4 for pidfd, new mount API, and signed Verity images