netfilter: xtables: document minimal required version

For both .33 and .32-stable.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Cc: stable@kernel.org
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/Documentation/Changes b/Documentation/Changes
index 6d0f1ef..f08b313 100644
--- a/Documentation/Changes
+++ b/Documentation/Changes
@@ -49,6 +49,8 @@
 o  udev                   081                     # udevinfo -V
 o  grub                   0.93                    # grub --version
 o  mcelog		  0.6
+o  iptables               1.4.1                   # iptables -V
+
 
 Kernel compilation
 ==================