Add `killasgroup` option to sample config file

supervisor/skel/sample.conf

@@ -62,6 +62,7 @@ serverurl=unix:///tmp/supervisor.sock ; use a unix:// URL  for a unix socket
 ;exitcodes=0,2                 ; 'expected' exit codes for process (default 0,2)
 ;stopsignal=QUIT               ; signal used to kill process (default TERM)
 ;stopwaitsecs=10               ; max num secs to wait b4 SIGKILL (default 10)
+;killasgroup=false             ; SIGKILL the UNIX process group (def false)
 ;user=chrism                   ; setuid to this UNIX account to run the program
 ;redirect_stderr=true          ; redirect proc stderr to stdout (default false)
 ;stdout_logfile=/a/path        ; stdout log path, NONE for none; default AUTO