Add reference to integriforce utility script.

Signed-off-by: Shawn Webb <shawn.webb@hardenedbsd.org>
github-issue:	#28

secadm/secadm.rules.5

@@ -265,6 +265,10 @@ secadm {
 .Xr execve 2 ,
 .Xr secadm 8 ,
 .Xr mac 9
+.Rs
+.%T "Integriforce utility"
+.%U https://github.com/HardenedBSD/secadm/blob/master/util/integriforce.zsh
+.Re
 .Sh AUTHORS
 .An Shawn Webb
 wrote the first iteration of