Mention new log keyword to services et al

Patrick Stewart added the optional `log` keyword to service, run, task
and inetd stanzas in 889bce1.  It redirects stdout/stderr to syslog
using the logger tool.  This addition to the README is mainly just a
place holder so it's not forgotten before the upcoming README refactor.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

README.md

@@ -240,6 +240,10 @@ multiple web servers, add `:ID` somewhere between the `run`, `task`,
 Without the `:ID` to the service the latter will overwrite the former
 and only the old web server would be started and supervised.
 
+The `run`, `task`, `service`, or `inetd` stanzas also allow the keyword
+`log` to redirect `stderr` and `stdout` of the application to syslog,
+using `logger`.
+
 
 /etc/finit.d
 ------------