README: Display old syntax if option --now not available (#334)

Display the commands that can be used when option --now is not supported
by systemd.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>

diff --git a/README.md b/README.md
index 91e924096b704e941284485b7dffaee4f219fb01..88129cba3775f629c9d9b47661eedd8151177162 100644 (file)
--- a/README.md
+++ b/README.md
@@ -101,6 +101,15 @@ On recent versions, systemd is used instead of cron. You may need to enable and
 $ sudo systemctl enable --now sysstat
 ```
 
+(or enter:
+
+```
+$ sudo systemctl enable sysstat
+$ sudo systemctl start sysstat
+```
+
+if option `--now` is not supported by your systemd version.)
+
 #### Install from Ubuntu
 
 Enter: